tag:blogger.com,1999:blog-8364119690573549952024-02-19T18:32:32.616-08:00Bottlenecks AudioUnknownnoreply@blogger.comBlogger24125tag:blogger.com,1999:blog-836411969057354995.post-85894915578565206762015-10-17T21:20:00.000-07:002015-10-17T21:20:50.397-07:00Burning Amp 2015<div style="text-align: center;">
Since I am Australian, I like to get a dose of civilization each year by going back to the home country. Since I live on the east coast half way between Baltimore and Philadelphia, I can go via LAX or SFO. I realized that the Burning Amp Festival 2015 in Redwood City, CA would be on roughly when I planned to go to Oz, so I arranged to stay a few nights with one of my nieces who lives in Alameda. Since it was a Saturday, it was no problem to cross the San Mateo bridge and trundle down 101 to Redwood City.</div>
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Admission was $25 and $10 for lunch (Indian)</div>
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I wandered around snapping photos but I did not take notes so just treat it all as DIY porn. It is all too easy to get mental overload at the variety of stuff so forgive me if I don't include descriptions.</div>
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The record with a bite out of it is a sacrificial record to be used while setting up the tone arm.</div>
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Several of the parts of this tone arm were created with a 3D printer. </div>
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Since the Pass DIY community usually builds solid state (transistor) amps, I was surprised to see quite a few tube amps but it is an agnostic fest and celebrates the wider DIY community.</div>
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I won't go into the sound quality since most of the rooms or areas were not at all ideal. </div>
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A Metronome.</div>
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I visited Cary Chin's Bottlehead room.</div>
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Cary in all his glory.</div>
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<a href="http://www.linkwitzlab.com/speakers.htm" target="_blank">Sigfried Linkwitz</a> speakers.</div>
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I was fortunate to have a brief conversation with Sigfried.</div>
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These were cute.</div>
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A wild room.</div>
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I was given a sample even though it was only 10 am. It was really interesting and oddly enough, reminded me of cognac. Medicinal purposes only, of course.</div>
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Tom is a fellow Australian from Brisbane who lives in California. He restores Sansui amplifiers.</div>
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An old pair of Alison 2 speakers.</div>
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Tom. I think we were both surprised to meet a fellow Aussie, particularly since we both come from South East Queensland. </div>
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Impressive array system with a couple of subwoofers lurking in the background.</div>
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The lecture area getting set up.</div>
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Another home made tone arm. </div>
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Prizes for the raffle. More prizes were added though out the day.</div>
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211 amp.</div>
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Power transformer for the 211 amp.</div>
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Beautiful wiring job.</div>
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These wild looking speakers use Eminence drivers. </div>
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Another elegant amplifier. I really should try to develop the patience needed to do this kind of work. </div>
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Interesting cone.</div>
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I forget which model Pass design this is but it was a very impressive build. Naturally it generates a tremendous amount of heat.</div>
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I did not find out what the drivers were on the open baffle but <a href="https://en.wikipedia.org/wiki/Montserrat_Caball%C3%A9" target="_blank">Montserrat Cabelle</a> was sounding pretty good through them.</div>
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Roger Modjeski of <a href="http://ramlabs-musicreference.com/" target="_blank">Music Reference and RAM Labs</a> brought along this distortion analyzer so that you could test your amp. He was also the third lecturer of the day with an excellent presentation on tube amp design for those who know more about transistors than tubes. I found the part about running tubes at higher voltages and lower current very intriguing.</div>
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If you are in the Bay area, you might be interested in the courses he runs at the <a href="http://berkeleyhifischool.com/" target="_blank">Berkeley Hi Fi School</a>. Part of the course involves winding your own transformers which I would find interesting.</div>
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The setup for the first lecture by Bryan Levin on Arduino based remote controls. </div>
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The beating of the gong used to summon the lecture audience.</div>
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Charlie Laub talking about implementing DSP and audio streaming on the Raspberry Pi.</div>
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Nelson Pass is introduced.</div>
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Implementing Schade Feedback on a mosfet. Go to <a href="http://www.diyaudio.com/forums/pass-labs/280950-baf-2015-coverage-5.html" target="_blank">post #43 for a link</a> to his slides.</div>
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I was fortunate to have a brief conversation with Nelson and thanked him for publishing the articles that got me into this hobby. I really enjoyed this fest, probably more than others I have been to because of the DIY emphasis. It was all very inspirational.</div>
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<br />Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-33708332044471200682015-06-01T05:54:00.000-07:002015-06-01T05:54:13.989-07:00Bottleneck Meet - May 2015<div style="text-align: center;">
We met at Steve's house again. John (2wo) came down with me in my Mini Coachman that was loaded to the gills with my stuff. The time goes much faster when you have somebody to talk to. The photos are blurry but you will get the idea.</div>
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A year or so ago, I bought a couple of the high QTS <a href="http://www.parts-express.com/goldwood-gw-1858-18-pro-woofer--290-386" target="_blank">Goldwood 18 inch speakers</a> that I tried in an H frame based on <a href="http://www.quarter-wave.com/Project08/Project08.html" target="_blank">Martin J King's article</a>. I soon had orders to remove them from our living room and so I disassembled them and the plywood sides of the H frame (16" x 21") have been used as top plates for my latest amplifiers.</div>
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At our last meet, Roscoe brought along his version of the JE Labs open baffle that uses these same speakers. I was very impressed by the quality and amount of low bass so I built my own version using laminated cherry flooring from Lowes. Instead of using a standard crossover, I used a <a href="http://www.t-linespeakers.org/tech/filters/passiveHLxo.html" target="_blank">PLLXO</a> and bi amped with a digital amp for the bass and my <a href="http://audioratbag.blogspot.com/2015/01/cat-vomit-special-6e5p-6c33c-parafeed.html" target="_blank">Cat Vomit 6C33C</a> amp on top.</div>
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I tried a few different speakers on top but eventually preferred the old 99 cent Parts Express speakers that were well received over a decade ago. I also brought along an array of these same speakers, 9 per side, mounted on a piece of polycarbonate (4' x 1').</div>
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The 99 cent speakers are the ones that PE sold initially, not the different 99 cent speakers they sold later that did not sound near as good.</div>
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To be honest, I was disappointed in how the arrays sounded, no where near as good as what I achieve at home. Room dependence may be one of the problems with open baffle arrays. Still, they didn't sound all that bad and in fact were pretty good.</div>
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And of course, I was stunned that both channels of my amp worked. I think the reason is that the plywood top plate flexes less than the polycarbonate I have been using for years. I don't like using metal since I invariably cut myself when I use metal.</div>
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We tried to get the Bottlehead DAC to work with my Dell netbook but had problems with the driver. John remembered that the instructions said that something special needed to be done but couldn't remember what since he uses a Linux server. We had listened to the B'head DAC earlier and it sounded very good but we couldn't do the ODAC / B'head DAC comparison as we had hoped. There is always next time. John also has the ODAC and says that the B'head DAC is much superior once it has broken in.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAy_7mTUcR-6kIzvE_cqw6s50U86a0MxL6d5zASm8tp_mqdW73M7e949fxpKWAkP6K6NEC2c197zx9z-EwB4tGl6Lcn5rqseKQsskdW5mpgN6IUINVruiRXxw68EG7uKnR5FpnswjVhqnT/s1600/002.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="428" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAy_7mTUcR-6kIzvE_cqw6s50U86a0MxL6d5zASm8tp_mqdW73M7e949fxpKWAkP6K6NEC2c197zx9z-EwB4tGl6Lcn5rqseKQsskdW5mpgN6IUINVruiRXxw68EG7uKnR5FpnswjVhqnT/s640/002.JPG" width="640" /></a></div>
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Steve then brought out his foam speakers powered by Dayton exciters. I was prepared to be underwhelmed, but to be honest, combined with the 18" woofers, this produced some of the best sound I have heard in Steve's room.</div>
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We were all amazed.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicC4CT3AvA-YtUiLysNEPOPTlymMpGWt1X8_ouGJVWm0tOmUw9bY2vuAUcVceA3Jn91Rr430Es99hWfei9QD5DDC-4Q37VSl2hnTIk9hc0qkiIVZryYJQgaj_7O7qqeYeWYr7SJ13eeyEi/s1600/003.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicC4CT3AvA-YtUiLysNEPOPTlymMpGWt1X8_ouGJVWm0tOmUw9bY2vuAUcVceA3Jn91Rr430Es99hWfei9QD5DDC-4Q37VSl2hnTIk9hc0qkiIVZryYJQgaj_7O7qqeYeWYr7SJ13eeyEi/s640/003.JPG" width="480" /></a></div>
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The <a href="http://www.parts-express.com/dayton-audio-daex32u-4-ultra-32mm-40w-4-ohm--295-235" target="_blank">exciter</a> which is currently out of stock at PE. It now costs $18.50. Note the cryogenically treated ultra pure silver cables.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5170zZ0St1FH62-JfZSk3hB9LMqns4C0iIewONtY1ByFQYws8DMoxiFo9Hkv5cfMXVFhPPwoWqy9LW25DUBVJAzmOC8Q6VDOKk3TRgQpKOjJOcvUuTLEL3yse29nmIgvZ8z1Ox05gS_J8/s1600/004.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="454" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5170zZ0St1FH62-JfZSk3hB9LMqns4C0iIewONtY1ByFQYws8DMoxiFo9Hkv5cfMXVFhPPwoWqy9LW25DUBVJAzmOC8Q6VDOKk3TRgQpKOjJOcvUuTLEL3yse29nmIgvZ8z1Ox05gS_J8/s640/004.JPG" width="640" /></a></div>
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I thought the panels improved when they were raised up on the chairs. We discussed possible diffent ways of suspending the panels.</div>
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We were all so impressed that we are going to hold a competition in October where your entry has to be a pair of panels driven by this exciter. I will bring along the same woofer open baffles so that we all just have to bring along our foam panels.</div>
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This is worth playing with. It's not perfect, but these panels produce better than decent sound and should be fun. Steve is going to send me some links to various discussions about these exciters and I will include them in the blog.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZgzQ5fvEQ0IYzX2y-tpAaxpZ7m748162o1uM4mzjU8iTPnE3Q-fpXaro9J7Jy7Q2pzqJ6Cfa0MQBvUZfxPczSD3L3k4ctKthRbSF_husAiO2kqIVopz9LViM2uhy-nEblYMOCxqQe6AGf/s1600/005.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZgzQ5fvEQ0IYzX2y-tpAaxpZ7m748162o1uM4mzjU8iTPnE3Q-fpXaro9J7Jy7Q2pzqJ6Cfa0MQBvUZfxPczSD3L3k4ctKthRbSF_husAiO2kqIVopz9LViM2uhy-nEblYMOCxqQe6AGf/s640/005.JPG" width="640" /></a></div>
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Very blurry photo of the electronics. The 6C33C amp is supposed to deliver 14 watts and it easily handled the foam boards.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVKpTYApJMXS-t2Y97IOn1fgszmtcILvANexvs_VPcKGaTgP_-Kmma-nxggpIQWJOBTSUvt08dszG7rUY7SPFDmOu2cR-FZ35fQEBdtkjIqcBpmrMJnnGTdQNyW0aB7RBo1faf_LHwjQeH/s1600/006.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="444" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVKpTYApJMXS-t2Y97IOn1fgszmtcILvANexvs_VPcKGaTgP_-Kmma-nxggpIQWJOBTSUvt08dszG7rUY7SPFDmOu2cR-FZ35fQEBdtkjIqcBpmrMJnnGTdQNyW0aB7RBo1faf_LHwjQeH/s640/006.JPG" width="640" /></a></div>
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Tony and Steve each had a pair of old Wharfdale speakers so they stacked them and we played them for a while. Earlier in the day, they had tried some other vintage speakers. All I can say is that the Wharfedales were nowhere near as good as the foam panels / 18" woofer combo. The treble seemed to be missing and there was not much bass.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjcCxwjKI29tNBUZi5T5iMzkeqGzQJ_dQMfvr52LcD0Jfnr1GcHUKVUXXes1tVBOXkoseahsIbY0_X8PvUq1aiXm5G4KpTlB20wEkyOIVdsJUG9LOBpqCy5MzlV8aE_CjtlnKvO2zPdz3zo/s1600/007.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="408" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjcCxwjKI29tNBUZi5T5iMzkeqGzQJ_dQMfvr52LcD0Jfnr1GcHUKVUXXes1tVBOXkoseahsIbY0_X8PvUq1aiXm5G4KpTlB20wEkyOIVdsJUG9LOBpqCy5MzlV8aE_CjtlnKvO2zPdz3zo/s640/007.JPG" width="640" /></a></div>
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We then tried a pair of old Radio Shack speakers and they sounded a lot better than the Wharfedales.</div>
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The other odd thing about this meet was that since we used my laptop as the music server, we listened mostly to music that I chose. Most of it was music we have listened to before but there was some new stuff, including some by <a href="http://www.amazon.com/Music-Italian-Renaissance-Shirley-Rumsey/dp/B0000013UZ/ref=sr_1_1?ie=UTF8&qid=1433162362&sr=8-1&keywords=shirley+rumsey" target="_blank">Shirley Rumsey</a>. Her voice is stunning.</div>
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We also listened briefly to Tony's <a href="http://www.koss.com/en/products/headphones/full_size_headphones/ESP950__ESP950_Electrostatic_Headphone" target="_blank">Koss Electrostatic headphones</a>. I loved the sound and they were very light and comfortable. Although I am not a headphone fan, I think I could live with these.</div>
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<br />Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-70287611403801157872014-10-19T09:03:00.000-07:002014-10-19T11:57:44.980-07:00Bottleneck Meet October 2014<div style="text-align: center;">
We met as planned at Steve's house to hold the competition. Since both of my entries were still not working, we just chose to listen to the various amps that turned up. No competition. <span style="text-align: center;">If you click on the pictures, you can enlarge them.</span></div>
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My first entry was a 4P1L push-pull parafeed amp with light bulb loads. The driver for each channel is a single 4P1L and the other amps are also 4P1L tubes. I had tried to use the 4P1L tubes back in the Russian line-stage competition but without success. My inspiration came from Andy Evans single ended amp. (<a href="http://db.audioasylum.com/mhtml/m.html?forum=tubediy&n=226204&highlight=4p1l&search_url=%2Fcgi%2Fsearch.mpl%3Fforum%3Dtubediy%26searchtext%3D4p1l" target="_blank">schematic here</a>). For the DC heaters I used the switched mode DC supplies <a href="http://bottlehead.com/smf/index.php?topic=3584.msg31805#msg31805" target="_blank">mentioned in the forum</a> by Henry's Cat. If you look at Andy's schematic, you will see that he uses filament bias which is supposed to sound better than cathode resistor bias. I initially tried that with some 15 ohm 50 watt resistors mounted on heat sinks that I mounted on standoffs. The little DC supplies appeared to work fine.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5DLVS4carzbcg_zcx24s2bymM0HODp7KcpST25PKM5p5M1QPa1pySZKpGVY17DYugWaLf3Lj2zP00rRbb0vriocDhmAzU5-ylyCGQQ_StvBmiM-77YYgsb-DNNzTwfaBdvw0lU19XVYTn/s1600/001.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5DLVS4carzbcg_zcx24s2bymM0HODp7KcpST25PKM5p5M1QPa1pySZKpGVY17DYugWaLf3Lj2zP00rRbb0vriocDhmAzU5-ylyCGQQ_StvBmiM-77YYgsb-DNNzTwfaBdvw0lU19XVYTn/s1600/001.JPG" height="480" width="640" /></a></div>
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The heat sinks got quite hot which I thought could prove problematic with the polycarbonate that I often use for my amps. The 4P1L tube can be sensitive to vibration so I did not want to use steel or aluminium. I then tried cathode resistor bias and it worked briefly in one channel but there were problems in the other channel that I was not able to solve in time. It was a real mess to wire.</div>
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The interstage transformers that do the phase splitting are a couple of cheap ones from Allied that I had in my stash. You can read about them <a href="http://db.audioasylum.com/mhtml/m.html?forum=set&n=15061&highlight=6W68HF&r=&search_url=%2Fcgi%2Fsearch.mpl%3Fsearchtext%3D6W68HF%26b%3DAND%26topic%3D%26topics_only%3DN%26author%3D%26date1%3D%26date2%3D%26slowmessage%3D%26sort%3Dscore%26sortOrder%3DDESC%26forum%3DALL" target="_blank">here</a>. </div>
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For the parafeed push-pull, I used this <a href="http://www.raleighaudio.com/figure_18.htm" target="_blank">schematic</a> with lightbulbs substituted for the DN2540 as resistors. The output transformers were Antek <a href="http://www.antekinc.com/as-2212-200va-12v-transformer/" target="_blank">2212</a> toroids. They are huge 200w units and were salvaged from another project. I had used toroids in the Ikea 6V6 competition and although they take a while to break in, they work fine in a parafeed arrangement.</div>
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The case was an old receiver that died when the <a href="http://bottlehead.com/smf/index.php?topic=4636.msg49732#msg49732" target="_blank">cat vomited</a> on the power supply. Catty-watty lived as you can see in the first photo. I kept running out of space so the huge toroid power transformer and choke were suspended underneath. Those are tomato cans from Aldi that hold it up. I also had to extend the amp vertically. Weight 41 lb.</div>
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I am now going to dismantle it and turn it into a single ended amp with filament bias and much bigger heatsinks. I won't use the old receiver box since it is too difficult to work down from the top.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinZFSh5YRPmjDYyOTCphM2048gQjACLRtoVS8NxMr-eJHfzEuIi3n3ysBlji87HcORzSKPbrHsXEzTldhOcEDOJiJ8M3CQ3GHsvn_MLh4NePM8A7zRDak1EDLlWsl6FJNCYrBR_aF2w2T7/s1600/024.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinZFSh5YRPmjDYyOTCphM2048gQjACLRtoVS8NxMr-eJHfzEuIi3n3ysBlji87HcORzSKPbrHsXEzTldhOcEDOJiJ8M3CQ3GHsvn_MLh4NePM8A7zRDak1EDLlWsl6FJNCYrBR_aF2w2T7/s1600/024.JPG" height="480" width="640" /></a></div>
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Years ago when we used to meet in Elkton, Doug gave me a power transformer and a few organ amps and chassis. John Hogan gave me a couple of Webster organ output transformers. With an old Hammond 193M choke, it weighs 47 pounds. The caps on the left are non functional other than making it easy to tip the amp over.</div>
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You might notice there are no input tubes. I was trying Bill Chater's cascode power-amplifier circuit from Glass Audio Vol 10 Number 5, 1998. It's fascinated me for some time so here was my chance to try it out. He used some KT88 tubes which I don't have so I used some 6HJ5 tubes that I had. I finally managed to fire it up the day before the competition but there was the magic puff of smoke. I have a rule that I wait at least a day after a smoke event so that I can calm down so the amp became the other display item. I am going to persevere with this amp. I figure I can do a John Hogan amp imitation by covering the holes with duct tape. Unfortunately John passed away about 10 years ago but his amps have become collector's items. He was a nice bloke.</div>
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We started with Steve's Econowaves.</div>
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Roscoe actually built an amp using an old Jolida chassis.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCDzsde6GqxWtCSAjAOWa4QrwqKnUTrxkqrROWUCfDR41CTWOhRKo-gXeMzXXW3iJDmEGe3r87l2-aTsrANehHodr-snSMBCvPLH1FckbrvBV7ph5ET_pYOF18bFveUMNMzVxirY4rkhiM/s1600/025.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCDzsde6GqxWtCSAjAOWa4QrwqKnUTrxkqrROWUCfDR41CTWOhRKo-gXeMzXXW3iJDmEGe3r87l2-aTsrANehHodr-snSMBCvPLH1FckbrvBV7ph5ET_pYOF18bFveUMNMzVxirY4rkhiM/s1600/025.JPG" height="430" width="640" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAxAnnHwYcCg2pMU5imOJ3Ss88jcwiYtmwmm5CUbNCh0_BWhrELkaig5psNbHZ_zqG574srdHDRC_akRao4BJlqlhJWfWwuz3iHniXby1Vsi8sN67v6ilsEtsQZAqo6vaM4urzQUatIr0Q/s1600/026.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAxAnnHwYcCg2pMU5imOJ3Ss88jcwiYtmwmm5CUbNCh0_BWhrELkaig5psNbHZ_zqG574srdHDRC_akRao4BJlqlhJWfWwuz3iHniXby1Vsi8sN67v6ilsEtsQZAqo6vaM4urzQUatIr0Q/s1600/026.JPG" height="496" width="640" /></a></div>
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It's a very interesting direct coupled design. Roscoe has given me permission to post the values. The output tubes are 5881 and the inputs are 5965. Please note Roscoe's followup:</div>
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<span style="background-color: #363636; color: #e3e3e7; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; line-height: 17.4720001220703px; text-align: start;">Please make the changes mentioned below before posting... A couple of comments based on some more measurements I took this AM.</span><br style="background-color: #363636; color: #e3e3e7; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; line-height: 17.4720001220703px; text-align: start;" /></div>
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<li>C4 & C5 should probably be upped to 250v types, as the voltage can be higher than 190V depending on how the output tubes bias up. The value probably would be fine at anything at or over 220uF (the values in your junk box are always the best ones to use, right?).</li>
<li>The power supply turns out to be much higher than I thought, at about 500Vdc. That runs the dissipation up to higher than 6L6/5881 limits, so I'd recommend either building with a B+ at more like 420-450Vdc, or running 6550 output tubes (which bias up just fine, tried it this AM).</li>
<li>Old Jolida amps don't cost all that much, especially if you can find one that needs work, and they make a good base platform w/o the need to do metal work, but keep in mind that you're pretty much stuck with a nearly 500Vdc B+ if you go that route, unless you do some serious work on the power supply filtering.</li>
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Considering that Roscoe finished it a couple of hours before the meet, it sounded very good, much better than the digital amp we started with.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_z6V7C7gchOUyeuR3Ju-eJSgc_gGeVUbNeVKFX_-_Fa3eCpYFu8Lqkj0TU4Tvmg76-8fMkM4fcbEmPG16yvItvnprX6lEiroczqNaV9GrqE3A1YcfHDPunDvlyCnxl4u7xmWIy15GyHRd/s1600/007.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_z6V7C7gchOUyeuR3Ju-eJSgc_gGeVUbNeVKFX_-_Fa3eCpYFu8Lqkj0TU4Tvmg76-8fMkM4fcbEmPG16yvItvnprX6lEiroczqNaV9GrqE3A1YcfHDPunDvlyCnxl4u7xmWIy15GyHRd/s1600/007.JPG" height="480" width="640" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEkaM8v3zaMPcn0m1m07ORJrBQaytwjVWoJ9zIV0lg14WmOVGr_9OTQNNWW9_3cKIotShT5cJDp__S9092_J6LwWmwKK_F6-FXrUshnFJrVIy3qNsRYRWuBnBvvdfiOe3G2Ez5HXDJEs2b/s1600/009.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEkaM8v3zaMPcn0m1m07ORJrBQaytwjVWoJ9zIV0lg14WmOVGr_9OTQNNWW9_3cKIotShT5cJDp__S9092_J6LwWmwKK_F6-FXrUshnFJrVIy3qNsRYRWuBnBvvdfiOe3G2Ez5HXDJEs2b/s1600/009.JPG" height="480" width="640" /></a></div>
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Some of the DACs etc we used. The top photo shows an early Bottlehead design.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgu_amnmK2gs_fFWpUq8zGKBxaNKP0KhpqVmLXYgIGSlu57bwxvurHvmJSAu7pG2HgfMliUu8sBebWBkhWPYQ2YOkLtMZtOLgrNl4Q6_x4R7MB_9GzBDktusI22H9oX4NQNyrXvIj03hcjm/s1600/005.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgu_amnmK2gs_fFWpUq8zGKBxaNKP0KhpqVmLXYgIGSlu57bwxvurHvmJSAu7pG2HgfMliUu8sBebWBkhWPYQ2YOkLtMZtOLgrNl4Q6_x4R7MB_9GzBDktusI22H9oX4NQNyrXvIj03hcjm/s1600/005.JPG" height="502" width="640" /></a></div>
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I had asked Roscoe to bring his open baffle speakers since I also have the <a href="http://www.parts-express.com/goldwood-gw-1858-18-pro-woofer--290-386" target="_blank">Goldwood 18" GW-1858</a> high QTS speakers which I currently have in H frames that my wife objects to. The other speaker is a <a href="http://www.parts-express.com/tang-band-w8-1808-8-neodymium-full-range-driver--264-894" target="_blank">Tangband W8-1808</a>.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqQGOZ378psAJWhRfSnp6TSzxuD85Jn9rLEeMX-VHGvtd5Vhh1Qic9BHECq6xvothxo9SNjLJ4S-Dkno_ZHnc8BnrSHFMl4p9KmTuy2gTTrUii4ndbJTT8PfcKQqk8oegNz0FuX7tqWGhQ/s1600/010.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqQGOZ378psAJWhRfSnp6TSzxuD85Jn9rLEeMX-VHGvtd5Vhh1Qic9BHECq6xvothxo9SNjLJ4S-Dkno_ZHnc8BnrSHFMl4p9KmTuy2gTTrUii4ndbJTT8PfcKQqk8oegNz0FuX7tqWGhQ/s1600/010.JPG" height="480" width="640" /></a></div>
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The design comes from JE Labs and is based on the old Briggs sand filled baffle speaker design. More about it <a href="http://jelabs.blogspot.com/2012/06/je-labs-open-baffle.html" target="_blank">here</a>.</div>
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Crossover.</div>
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The handles are useful for carrying the beasts.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhKq3LcqeQhdyPhE58l3Vum62HZK8NuQnrrwQeCUiXhyphenhyphenFL13PxBYB8J7Gq8yX3ltEb8NN8Efq9PElohHwqi67D3nyRpZqAc7OhtOlKVvTy13WACszeBultCCwGiyqxb5MvDS2Y9V9V_brrn/s1600/015.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhKq3LcqeQhdyPhE58l3Vum62HZK8NuQnrrwQeCUiXhyphenhyphenFL13PxBYB8J7Gq8yX3ltEb8NN8Efq9PElohHwqi67D3nyRpZqAc7OhtOlKVvTy13WACszeBultCCwGiyqxb5MvDS2Y9V9V_brrn/s1600/015.JPG" height="640" width="564" /></a></div>
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We were mightily impressed by how low the bass would go with these beasts. I liked the sound of the Tangbands and it all integrated very well. I've told my wife that I'm going to build the Mondrian version that you can see at the bottom of the <a href="http://jelabs.blogspot.com/2012/06/je-labs-open-baffle.html" target="_blank">link</a>. Since the Tangbands are quite expensive I will think about some alternatives.</div>
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Roscoe also brought along the Western Electric design amp that he demoed at the prior meet. It was richer and fuller than the Jolida chassis amp, but remember that the latter was only finished that morning. Later Roscoe substituted the 5881 tubes and there was a smoke event.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8uaCIwWwEuJpbs6ezAPtVrUHdnbbre23T8cqGXhb5o3IoNV7FuJ9QY9yG9y_VOiWNPVPRzEzAdaErn6CGoIaDdo2QfvxPVqbHlZJTZg_1rW26LL1Nd5zOdXIrtBboWOfmYlLnT9E_q_2B/s1600/016.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8uaCIwWwEuJpbs6ezAPtVrUHdnbbre23T8cqGXhb5o3IoNV7FuJ9QY9yG9y_VOiWNPVPRzEzAdaErn6CGoIaDdo2QfvxPVqbHlZJTZg_1rW26LL1Nd5zOdXIrtBboWOfmYlLnT9E_q_2B/s1600/016.JPG" height="480" width="640" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVR4A9yzeMJPmiZbpdKQ2T9Pr23mU5JjUzaHZGAag-Udy840b4m8nduz6J9lj5VYajd3l2l909shrpABDwEaZZ8TWUYHBia5z8LBH0GhgnzZbqt777-osCnPzwYUVBwLYm_h3m4KzWTPYp/s1600/021.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVR4A9yzeMJPmiZbpdKQ2T9Pr23mU5JjUzaHZGAag-Udy840b4m8nduz6J9lj5VYajd3l2l909shrpABDwEaZZ8TWUYHBia5z8LBH0GhgnzZbqt777-osCnPzwYUVBwLYm_h3m4KzWTPYp/s1600/021.JPG" height="448" width="640" /></a></div>
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David brought along an ST-70. It had the traditional tube sound with a weaker treble and bass than Roscoe's amps. The ST-70 front end was traditionally thought to be its weak point and now I can understand why.</div>
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Tony bought along a set of Climax speakers that he was planning to wire up during the meet.</div>
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The crossover box.</div>
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Hard at work. Tony also brought along a few headphones to try out which I found very useful since I spend a few months each year travelling now that I am retired. The inner ear phones just don't work for me and I think I will investigate inexpensive closed back over ear models that can take a beating.</div>
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Unfortunately I was not able to hand around to hear the Climaxs. It was my 39th wedding anniversary and my wife was preparing a special dinner. Salmon rat coffins (salmon in puff pastry) and a fig jam souffle for desert.</div>
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There were only five of us there but we had a great time and heard plenty of interesting music. We are thinking of holding another meet in January. It will be a last minute scheduling affair depending on the weather. Thanks to Steve for hosting.</div>
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For those who are interested, <a href="http://ratbagp.blogspot.com/2014/05/narvik-to-lulea.html" target="_blank">here</a> is a link for my train trip from Narvik in Norway to Singapore which occurred earlier this year.</div>
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<br />Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-71989827903121517552014-04-01T13:32:00.000-07:002014-04-01T13:32:55.198-07:00Push-Pull Salvage Amplifier Competion<div align="center" class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px;">
<strong><span style="font-size: medium;">Push-Pull Salvage Amplifier Competition</span></strong></div>
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<span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><strong>Objective: </strong>to build a stereo push-pull amplifier based on parts that you already own. Participants may use any design utilizing push-pull output topology. </span></div>
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<span style="font-size: small;"><strong>The Place: </strong>Stirling, VA (near Dulles airport)</span></div>
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<span style="font-size: small;"><strong>The Date:</strong> Sunday, October 18 2014. Kickoff probably at 10am.</span></div>
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<strong><span style="font-family: Arial, Geneva, sans-serif; font-size: medium;">Building your own amplifier is very dangerous, particularly with the high voltages involved. We will not be held responsible for any injuries caused by you building your amplifier. This competition is not for novice builders. We highly recommend that novices build one or more <a href="http://www.bottlehead.com/et/et.html">Bottlehead kits </a>before considering a scratch build like this.</span></strong></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial; font-size: small;">1. We will <u>not</u> accept entries that are shipped to the competition. <u>You need to carry the amp in through the door at the competition.</u> If you live in another part of the country, you might consider holding a similar competition in your own region. We will not be responsible for items that are shipped to us.</span></span></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">2. There is no minimum or maximum total cost of the amplifier. We encourage you to use or reuse items that are currently in your stash. We are not religious about this and to be honest, we have no way of knowing what is in your stash anyhow. </span></span></span></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">3. </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt; line-height: 15pt; text-indent: -0.25in;"><span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;"> </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt; line-height: 15pt; text-indent: -0.25in;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">You may use any output tube(s) you like provided there are at least two tubes per channel. Use of output tubes with two sections such as an 829B is permitted. You may use any tubes you like for input, rectifier, regulation, etc. You may also use sand in the driver circuit. Try to be innovative and use some techniques you haven't tried before.</span></span></div>
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<span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: small;">4.<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;"> </span></span></span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">The amp can be any class you like - class A, class AB, class B, class C, triode, ultralinear, screen driven etc</span>. </span></span></span></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">5. For safety reasons, the amplifier will include an IEC connector, an on-off switch, a fuse, at least one power transformer and a bleeder resistor. Please include an extra fuse taped next to the IEC connector. No wiring carrying more than 1 volt (AC or DC) should be able to be touched from the top or sides. Please observe the voltage and power dissipation limits for all components. All components should be mounted into place. No clip leads are allowed.</span></span></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">6. A schematic and a list of all materials with part numbers and pricing needs to accompany the amplifier. As much as possible components, both passive and active, should come from your stash. You may use components that are made of unobtanium in addition to components purchased from Ebay vendors</span><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">. If you do not know the price of a component, make an informed guess.</span></span></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">7. </span></span></span></span><span style="font-size: small; line-height: 15pt; text-indent: -0.25in;">Just for the fun of it, the case should come from or include some salvaged piece of audio or electrical gear such as an old receiver. Be imaginative. </span></div>
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<span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: small;">8</span>.<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;"> </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">All amps shall be evaluated using the same speakers and source. We currently expect to listen to the amps at Steve’s place in Stirling, VA using </span><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">speakers with an efficiency of 96 db, possibly higher. </span></span></span></span></div>
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<span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: small;">10</span>.<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;"> </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">All amps shall be evaluated using an identical compilation of music of approximately 15 - 20 minutes depending on the number of entries. The selection will be eclectic and include classical, blues and other genres. Typically, the music will be from CDs that have been enjoyed at our regular meets.</span></span></span></span></span></div>
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<span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: small;">11</span>.<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;"> </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">We will provide simple prizes for best sound, lowest cost and funkiest appearance. If we can come up with a formula we will attempt to give an overall 'First Prize'.</span></span></span></span></div>
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<span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;"><strong>Set up:</strong></span></span></span></span></div>
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<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">Prior to the start of the competition, all amplifiers will be turned on to ensure that they are working</span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">As much as possible, the same setup and positioning will be used for all equipment</span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">A test tone at roughly 440 hz will be used to set the volume with some kind of sound meter in a fixed position.</span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">All amplifiers will be invisible to the audience, even while not playing.</span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">All amps will be numbered. The order of playing the amps will be drawn from a hat.</span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">One designated person will be responsible for hooking up each amp. This person will not take part in the scoring.</span></span></li>
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<ul style="list-style-position: inside !important; margin-bottom: 0.3em; margin-top: 0.3em;">
<li><span style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">Depending on the number of entries, we may need to limit the number of judges at the discretion of the organizers.</span></span></span></span></li>
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<li><span style="font-size: small;">If the number of judges is limited, priority will be given to those who regularly attend our Bottleneck meetings.</span></li>
<li><span style="font-size: small;">Each judge will be presumed to have either cloth or tin ears.</span></li>
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<span style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;"><strong>The judging process:</strong></span></span></span></span></div>
<ul style="list-style-position: inside !important; margin-bottom: 0.3em; margin-top: 0.3em;">
<li><span style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">Each judge will be given a score card (and pencil) and will sit in an assigned chair throughout the contest.</span></span></span></span></li>
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<li><span style="font-size: small;">No discussion while music is playing or for 30 seconds thereafter when the score must be written down.</span></li>
<li><span style="font-size: small;">The scoring system is not yet finalized</span></li>
<li><span style="font-size: small;"> There will be a preliminary round where all amplifiers are auditioned. The top three amps will go on to a final round with a different music selection.</span></li>
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-22801098352044885522014-03-30T08:01:00.000-07:002014-03-30T08:01:02.756-07:00Bottleneck Meet - March 2014<div style="text-align: center;">
It had been almost two years since we had last met so I think we all very pleased to meet up again.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEibhTjCL50NyGaUy8Wj_JgFD_zsc-WhZj5GyyAyNFOPCz5IiD9NZpcS1umdKqMU18OsO-Mly2pdvamnm7bl48bKTnT3METRwgRt5UYYIWeMIHTaDAje5CG0FFa-pcryAyRYD5CqeospeVIM/s1600/2-2-2014+001.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEibhTjCL50NyGaUy8Wj_JgFD_zsc-WhZj5GyyAyNFOPCz5IiD9NZpcS1umdKqMU18OsO-Mly2pdvamnm7bl48bKTnT3METRwgRt5UYYIWeMIHTaDAje5CG0FFa-pcryAyRYD5CqeospeVIM/s1600/2-2-2014+001.jpg" height="504" width="640" /></a></div>
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On the left is Roscoe's amp. Then a few digital amps, a CD player and some sort of DAC. I am not sure what was what so if you know what was there, let me know and I will update this.</div>
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I was busy sitting on the sofa relaxing.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEglJvbbxWQwjn3MWj9Koo7d4MP-gGX0UIU_knK_-T7o73fIEpQ5c6qD8DTO-iXahazGJ2_wfaNRJw1AbwyyxBZ0h6g9-5skB1SQWuyAsBxqtN5eqqolbxEtBmtdly6-gZI0JE6emDkXJFoq/s1600/2-2-2014+002.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEglJvbbxWQwjn3MWj9Koo7d4MP-gGX0UIU_knK_-T7o73fIEpQ5c6qD8DTO-iXahazGJ2_wfaNRJw1AbwyyxBZ0h6g9-5skB1SQWuyAsBxqtN5eqqolbxEtBmtdly6-gZI0JE6emDkXJFoq/s1600/2-2-2014+002.jpg" height="388" width="640" /></a></div>
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Roscoe's push pull amp. It uses 6L6's as outputs and <a href="http://www.radiomuseum.org/tubes/tube_77.html">type 77</a> as the input. The 77 has a top cap but it is connected to the grid so quite safe for <a href="http://bottlehead.com/smf/index.php/topic,4636.0.html">vomiting cats</a>.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMBEXiBg2S7kok4wb9DlFSKlEzux4mbC9tsYbX9NmMUIi2pMcAMRY36cXmCqfKNBxfUXml0OCPLWJev7Y51IZsKdbafh3q94A56X_VvIGD3wGkizmAmUXhC5Tu0kebbjncmAs-IYbssGSO/s1600/2-2-2014+003.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMBEXiBg2S7kok4wb9DlFSKlEzux4mbC9tsYbX9NmMUIi2pMcAMRY36cXmCqfKNBxfUXml0OCPLWJev7Y51IZsKdbafh3q94A56X_VvIGD3wGkizmAmUXhC5Tu0kebbjncmAs-IYbssGSO/s1600/2-2-2014+003.jpg" height="236" width="640" /></a></div>
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Roscoe had used an old Phase Linear chassis and was in the VU meters to work. This was a very fine amp indeed and had real grip in the bass. It blew away the digital amps and reminded me of Doug Piccard's push pull monster amps that he brought to our first meets a decade ago.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjh2EP5XunT8XtBzPO0nc6kjD60jj_h6MdkvShh3gVKLdV5mHOcguHBphyphenhyphenRduCoWORpzZCy7OdnHvSi94FEtPBkTPUrszvvP2WsQ-dO0M3ziU1XWgGaEZYMTZ9fwIUIflvSJHzLTmKEIomD/s1600/2-2-2014+004.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjh2EP5XunT8XtBzPO0nc6kjD60jj_h6MdkvShh3gVKLdV5mHOcguHBphyphenhyphenRduCoWORpzZCy7OdnHvSi94FEtPBkTPUrszvvP2WsQ-dO0M3ziU1XWgGaEZYMTZ9fwIUIflvSJHzLTmKEIomD/s1600/2-2-2014+004.jpg" height="426" width="640" /></a></div>
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Another view of the other stuff.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiP8SaJCQMHBhGvecDcyamgrXuOrhFc72oPA_tPB4R6vjfAb_dvZO40ETf-5vL2AnVsF-AFYSAXovj5BYIUqM5wSi3ZzL2SXXdwEFOx1LDUfPiN3bpzkBsRkYP4WYRXw3GDuRvCwXnazbyQ/s1600/2-2-2014+005.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiP8SaJCQMHBhGvecDcyamgrXuOrhFc72oPA_tPB4R6vjfAb_dvZO40ETf-5vL2AnVsF-AFYSAXovj5BYIUqM5wSi3ZzL2SXXdwEFOx1LDUfPiN3bpzkBsRkYP4WYRXw3GDuRvCwXnazbyQ/s1600/2-2-2014+005.jpg" height="634" width="640" /></a></div>
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Don brought along his Crack and we listened to it through a pair of Sennheiser 650's that formerly belonged to Doc B. They are the Eargasmic cord and sounded much better than another pair of cans that only cost about $100. I can't remember what they were.</div>
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We also tried a tricked out Smack but somehow after a brief listen, I marginally preferred the Crack. Perhaps I would have changed my mind if both systems were fully warmed up. My contribution for the day was an ODAC fed by the USB port on my netbook running JRiver. This ODAC seems to keep improving and I have used it a lot for over a year. </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhudR4tCVZt_DUmeZllQAJ-cGYHzkH3VdSWQMthUzcQzVuory3b8ckVpwtXUvMvtgQ5I_lBphL4UnIenV8eJo3y39Q6ZMN-_58W0KjE4erLLJhv61J3C8sMA0W6HYfj4BTeKje5NhuSvGMS/s1600/2-2-2014+006.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhudR4tCVZt_DUmeZllQAJ-cGYHzkH3VdSWQMthUzcQzVuory3b8ckVpwtXUvMvtgQ5I_lBphL4UnIenV8eJo3y39Q6ZMN-_58W0KjE4erLLJhv61J3C8sMA0W6HYfj4BTeKje5NhuSvGMS/s1600/2-2-2014+006.jpg" height="640" width="482" /></a></div>
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Tony positions his cardboard box with a <a href="http://www.parts-express.com/dayton-audio-ps220-8-8-point-source-full-range-neo-driver--295-346" target="_blank">Dayton 8" full range driver</a>. </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4gl2JXj8Y2TAK4TwlADY3ylpssTTFefkaQnBwhVHLCrVBGAXqOlNaIYhYfsTsNtRl9zF__8VR8vd1oZet4kA5Oo7K_49eFvU7QFAPS2iq9tB4PKxuI1O5075xM2U4RgpKUAVCp_semPVB/s1600/2-2-2014+007.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4gl2JXj8Y2TAK4TwlADY3ylpssTTFefkaQnBwhVHLCrVBGAXqOlNaIYhYfsTsNtRl9zF__8VR8vd1oZet4kA5Oo7K_49eFvU7QFAPS2iq9tB4PKxuI1O5075xM2U4RgpKUAVCp_semPVB/s1600/2-2-2014+007.jpg" height="500" width="640" /></a></div>
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Tony connect the driver. A smart phone provided the light.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjrXGeoZXeHBA856gx0ZKJGgVpBXnxOvoC2o1AvNpy-VXcKNhyphenhyphen1IwVidrdtmnpns-zu-ZA8SVrg48YcuxOW8lW8UBGIiInF8kRVhACUaxzXC2B8E7O23oVfDAevDDg6N0am6JksuCEUufA2/s1600/2-2-2014+008.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjrXGeoZXeHBA856gx0ZKJGgVpBXnxOvoC2o1AvNpy-VXcKNhyphenhyphen1IwVidrdtmnpns-zu-ZA8SVrg48YcuxOW8lW8UBGIiInF8kRVhACUaxzXC2B8E7O23oVfDAevDDg6N0am6JksuCEUufA2/s1600/2-2-2014+008.jpg" height="316" width="640" /></a></div>
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Now if you don't look too closely, this setup really looks impressive. Actually the speakers sounded surprisingly good driven by Roscoe's amp and a Dave Slagle autoformer volume control. There was a mid range peak that could be cured by a <a href="http://diyaudioprojects.com/Forum/viewtopic.php?f=11&t=4363" target="_blank">notch filter</a>. Roscoe also has a pair that he uses in an open baffle with 18" drivers for the bass. </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEIWCL5kLn67y6ztL1jbtDGzA7ktlWlmI7_smgD8If2Znu-XcLcqc9h6st8HMthrpT7QKZ9Z65oMC91S2WwSTky1Oo8MM3lI2Ekyk_hVEQfavLtAximHAq7Aa3jXc-XdvLmeS3_AYZZi7u/s1600/2-2-2014+009.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEIWCL5kLn67y6ztL1jbtDGzA7ktlWlmI7_smgD8If2Znu-XcLcqc9h6st8HMthrpT7QKZ9Z65oMC91S2WwSTky1Oo8MM3lI2Ekyk_hVEQfavLtAximHAq7Aa3jXc-XdvLmeS3_AYZZi7u/s1600/2-2-2014+009.jpg" height="416" width="640" /></a></div>
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Steve's MLTLs with Mark Audio CHR-70's. They sounded very good but could not deliver as much oomph as the Daytons.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjaPbfJKIHY8pAWc4G_JH9WmULwK1i0RQVu1rHbPkn9VtLP8qVqyzCfzR1N_mTfLemPrhB_OhZ7mOo6EltcH6vazfn0XuuVQEhLmPvK0zbgUylnXRyJ1zRScC4DtjBQNKsfp4H0PzCBzQYi/s1600/2-2-2014+010.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjaPbfJKIHY8pAWc4G_JH9WmULwK1i0RQVu1rHbPkn9VtLP8qVqyzCfzR1N_mTfLemPrhB_OhZ7mOo6EltcH6vazfn0XuuVQEhLmPvK0zbgUylnXRyJ1zRScC4DtjBQNKsfp4H0PzCBzQYi/s1600/2-2-2014+010.jpg" height="480" width="640" /></a></div>
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Don also brought along his guitar amp and played for a while. Unfortunately I was in the kitchen listening to the Crack and the headphones at the time so I missed out.</div>
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<br />Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-23911826555428191422013-08-03T06:10:00.002-07:002013-08-03T06:10:21.163-07:00Tubes and cats<div style="text-align: center;">
I am trying to work out how to design an tube amp where it is safe for the cat to sit on in winter when she gets cold.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4U2OgoiniONApsgT0dVFhyphenhypheniI37jxFuCWg166CSv4XCUQwVy0DGrUygw3C5fk5ngNVMSlJy3bpGjl8eDa2BER0T3CgTEaQ-GrFd0kAeFPSKsabG8aVm0YPQfSLEukM4OFshFT_f699G0Hu/s1600/IMG_2036.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4U2OgoiniONApsgT0dVFhyphenhypheniI37jxFuCWg166CSv4XCUQwVy0DGrUygw3C5fk5ngNVMSlJy3bpGjl8eDa2BER0T3CgTEaQ-GrFd0kAeFPSKsabG8aVm0YPQfSLEukM4OFshFT_f699G0Hu/s320/IMG_2036.jpg" width="240" /></a></div>
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Here she is on my 6V6 lightbulb amp.</div>
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The design actually works pretty well in that the 6V6 tubes are not directly under her and if she throws up the muck will not dribble down into the amp itself.</div>
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Other design ideas would be welcome. I would particularly be interested in ideas that allowed me to use tubes with top caps or that put out more heat than a 6V6.</div>
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<br />Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-62711308017705738982012-10-20T13:40:00.001-07:002012-10-20T13:40:23.417-07:00Speaker wire comparison<div style="text-align: center;">
Our group is to hold a meeting where we will do blind comparisons between different materials and typologies of speaker wire. See the following link.</div>
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<a href="http://www.bottlehead.com/smf/index.php/topic,3273.0.html">http://www.bottlehead.com/smf/index.php/topic,3273.0.html</a></div>
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I have had trouble finding 64 feet of barbed wire without buying a huge roll of the stuff so I have decided to go the DIY route and create my own out of galvanized steel wire. A 100' roll of 17 gauge cost under $3.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaeHeVdU7vDfhnF52JQkhkEU5sr6B2G55TVI-ouBZYBI3QitwUP0PDrtDnkSnTSsRkvKrCMCsSd-WMCGRxBih5O6BbY5IWkGm6ZM2AW28I2L8tdwG9J6volneiAhPad78SIUQTV0lsx3CM/s1600/IMG_1537%5B1%5D.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaeHeVdU7vDfhnF52JQkhkEU5sr6B2G55TVI-ouBZYBI3QitwUP0PDrtDnkSnTSsRkvKrCMCsSd-WMCGRxBih5O6BbY5IWkGm6ZM2AW28I2L8tdwG9J6volneiAhPad78SIUQTV0lsx3CM/s400/IMG_1537%5B1%5D.jpg" width="400" /></a></div>
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The popsicle sticks come from Dollar Tree and a $1 pack is way more than enough. I simply drilled two small holes about three inches apart and then used hot glue to get the popsicle sticks to stay roughly in place. I am just going to leave the wire un-terminated. I don't want the sonic purity of the steel contaminated by gold, silver banana plugs etc. The wire is not insulated except for the popsicle sticks and glue.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhYSk7yn6vKVEhd5zZ_8zri0TaISE566iI26vPf-EBuC7Ls7h0dWBWSSTloz6g50CByqT5t85SHR-Ws-ZLwQGf1w4Dxfxa4xEPRRkkqB1LS18qUQur1rLGhBdFHosBgxpXtTAUlQC59GgVm/s1600/IMG_1538%5B1%5D.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhYSk7yn6vKVEhd5zZ_8zri0TaISE566iI26vPf-EBuC7Ls7h0dWBWSSTloz6g50CByqT5t85SHR-Ws-ZLwQGf1w4Dxfxa4xEPRRkkqB1LS18qUQur1rLGhBdFHosBgxpXtTAUlQC59GgVm/s400/IMG_1538%5B1%5D.jpg" width="400" /></a></div>
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I am putting barbs on one set of the cables. This should raise the cables above the floor and we can do a comparison on barbed versus the un-barbed which will lie on the floor.</div>
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You don't see too many speaker wires like this.</div>
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I haven't tried them yet but I will hook them up prior to the meet and bask in their sonic splendor.</div>
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<br />Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-3945309412309873622012-09-17T15:57:00.001-07:002012-09-17T17:36:43.496-07:00Visiting Swordfishy (aka GregH2)For those of you who have built a Fetzilla, you might be interested in my visit to Greg (aka Swordfishy and now GregH2) who lives on the outskirts of Brisbane. Greg was one of the main developers of the Fetzilla amplifier.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIS3NnRfl4CGXOFx10ztdJExWRj6zV3leaCufWmLlg7mupv_FGwvkhWupTUxFgV99D5nlhlEABelsi6C2ru71MZb7PhTlNrQaHZgfZISx357ptTGiVQ_81fSP1dzHDXThd9RWxWtESGVPP/s1600/IMG_0400.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="226" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIS3NnRfl4CGXOFx10ztdJExWRj6zV3leaCufWmLlg7mupv_FGwvkhWupTUxFgV99D5nlhlEABelsi6C2ru71MZb7PhTlNrQaHZgfZISx357ptTGiVQ_81fSP1dzHDXThd9RWxWtESGVPP/s400/IMG_0400.JPG" width="400" /></a></div>
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Greg along with his dogs. All three were very friendly.</div>
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Greg's paddock.</div>
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The BMW.</div>
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The Buick engine that eventually will go into the BMW.</div>
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Greg's version of the Fetzilla.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_lWrT2rJiYu48A_Y7t0BkhkU9S_cErbl7YJGo58ksDDCsfD8awBKUVvBTY-D76QlO5noe4QbnWiV1PLR_Ip9Nd4sOUtsdFp0UTYxe60MGN-6SgB_9woTAOZvgEaMWl7-xlHn5EgtQRYGR/s1600/IMG_0409.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="211" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_lWrT2rJiYu48A_Y7t0BkhkU9S_cErbl7YJGo58ksDDCsfD8awBKUVvBTY-D76QlO5noe4QbnWiV1PLR_Ip9Nd4sOUtsdFp0UTYxe60MGN-6SgB_9woTAOZvgEaMWl7-xlHn5EgtQRYGR/s400/IMG_0409.JPG" width="400" /></a></div>
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Listening to Greg's system. The speakers are Yamaha.</div>
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Greg's Fetzilla is a little different from the version that we all built with the boards from Hugh. One obvious difference is that he uses a larger value inductor which he reckons produces a more relaxed sound. In addition Greg's power supply is not on the board.</div>
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We started off listening to a Dayton class T amp from Parts Express that cost about $100. To be honest, I was not that impressed by it though the bass was good. There was just no 'air' about the instruments and singers. Greg then hooked up his Fetzilla and the improvement was very dramatic. The 'air' was there and the bass was much tighter. I had bought a friend along who is not interested in hifi at all and even he immediately could tell the difference. We could have listened for hours but it was time to go. I can't comment on whether it sounded different to my Fetzilla but if there is one factor in common, it would be that these amps are very easy and very satisfying to listen to.</div>
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Before we got into the listening session, Greg took us down to the basement where he had stored his Tesla coil experiment that he built when he was 15. He wound the coil by hand.</div>
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Giant transformers.</div>
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We really enjoyed our time at Greg's place. He has a couple of ideas for future amps and hopefully these will come to fruition.</div>
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<br />Unknownnoreply@blogger.com2tag:blogger.com,1999:blog-836411969057354995.post-75097326115834283512012-05-13T06:37:00.000-07:002012-05-13T06:37:45.979-07:00Full range speaker competitionOur full range loudspeaker competition (May 2012) proved to be very interesting. After all of our discussions about 'helper' speakers to assist at the bass or treble ends, none of the five entries used them. Unfortunately we were not able to use the small meeting room at the library and we had to be in the large (38' x 38') room. I thought there might be problems with small full range speakers generating enough volume, but all were able to play loudly enough.<br />
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We did find an interesting room node however. If you stood at one spot, the image of an instrument was between the speakers. Move six inches to the right and the instrument moved into a corner of the room, twenty feet away.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxM2jDzY-h2a9Qd-sBvOvxs6HD1K1P3jHv9_gipW5I2fwlOVTzU5j8V7yL_Ygi2UQyGOBoAB04kOGKfV_P2XSCVvWxw_zDRtmViBZPRxsuIBZZVC06vBtGOFzNuCbWotTV69Fn_El6U_0g/s1600/IMG_4137.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxM2jDzY-h2a9Qd-sBvOvxs6HD1K1P3jHv9_gipW5I2fwlOVTzU5j8V7yL_Ygi2UQyGOBoAB04kOGKfV_P2XSCVvWxw_zDRtmViBZPRxsuIBZZVC06vBtGOFzNuCbWotTV69Fn_El6U_0g/s400/IMG_4137.JPG" width="300" /></a></div>
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First up were David's <a href="http://www.madisoundspeakerstore.com/approx-3-fullrange/fountek-fr88ex-3-full-range/">Fountek FR88 EX</a> speakers in a half litre cabinet. These were not really designed to be run full range and had a capacitor designed to roll off below 200 hz to protect the small speakers.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgLyejI-jleoMR0cnPCg8aH0O5uzsA6DbPaXWfqx26RClZjlj_UlJh3TkjiGI1e3sPMRXVxvHEwITfd8wJIPWL0NNOJBWA0yzpe8Ul5hZm5DNPduf_BpibtIx9szQA56EBF738IuZPh7GQ2/s1600/IMG_4133.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgLyejI-jleoMR0cnPCg8aH0O5uzsA6DbPaXWfqx26RClZjlj_UlJh3TkjiGI1e3sPMRXVxvHEwITfd8wJIPWL0NNOJBWA0yzpe8Ul5hZm5DNPduf_BpibtIx9szQA56EBF738IuZPh7GQ2/s400/IMG_4133.JPG" width="300" /></a></div>
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Next were Don's <a href="http://www.parts-express.com/pe/showdetl.cfm?Partnumber=264-904">Tangband W5-1880</a> speakers in a 4 litre aperiodic box. Don has wood working skills that I can only begin to dream about.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8xMp_AERpg4PpdXAOAssxvhq2T2w5UwlUlEGXWjzNJTcnfScPLlXXqgGFuOmuwyQlJtrb4r60J5aFTr3Y2Nn4PukqPtj0iUxtOWhy7L_H1oA2xvDbnTihJBv8y2WkoRrn7RG4vq84-JdW/s1600/IMG_4139.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8xMp_AERpg4PpdXAOAssxvhq2T2w5UwlUlEGXWjzNJTcnfScPLlXXqgGFuOmuwyQlJtrb4r60J5aFTr3Y2Nn4PukqPtj0iUxtOWhy7L_H1oA2xvDbnTihJBv8y2WkoRrn7RG4vq84-JdW/s400/IMG_4139.JPG" width="300" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj71mem-RJO29NTpIQgHjAf-jzBYUmY7l_qSSrNCLHMgDmLjF4FMPeY63kDOvsJoKuk9TBmvb_M28rka1-KMx9Nm-wbfYpepo5p8xkREnaipJyNSf4KTJ3M6Gbm0okJAEElNwMMFZP9QrT1/s1600/IMG_4140.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj71mem-RJO29NTpIQgHjAf-jzBYUmY7l_qSSrNCLHMgDmLjF4FMPeY63kDOvsJoKuk9TBmvb_M28rka1-KMx9Nm-wbfYpepo5p8xkREnaipJyNSf4KTJ3M6Gbm0okJAEElNwMMFZP9QrT1/s400/IMG_4140.JPG" width="300" /></a></div>
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Steve used <a href="http://www.madisoundspeakerstore.com/approx-4-fullrange/markaudio-alpair-7-gen3-grey-cone-4-full-range/">Mark Audio Alpair 7</a>s in his MLTL speakers. These were approximately 5 feet tall and were made from 1x8 pine cut to the appropriate lengths. Steve used Martin King's spreadsheets to calculate the dimensions. It was nice looking pine.<br />
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Ray used the less expensive Mark Audio CHR-70 Version 3 speakers in what he calls an H frame horn. There is a write up on the construction of these concoctions <a href="http://bottlenecksaudio.blogspot.com/2012/03/h-frame-horn.html">here</a>.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmrp_QJPFRO0WmktuiJKDfJb5OXjYj79gNgeAfmtll60cfY7lHBx_iiM3X3uE8dkp_8CS3BbpEfKGmZilP5tlThLB0_zA3hQjws9n3Qgd-RaGotiIZFNSMlw0umKP4scoqKwGEs7pPDW73/s1600/IMG_4131.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmrp_QJPFRO0WmktuiJKDfJb5OXjYj79gNgeAfmtll60cfY7lHBx_iiM3X3uE8dkp_8CS3BbpEfKGmZilP5tlThLB0_zA3hQjws9n3Qgd-RaGotiIZFNSMlw0umKP4scoqKwGEs7pPDW73/s400/IMG_4131.JPG" width="400" /></a></div>
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Our final entry was John's simple open baffles using the <a href="http://www.parts-express.com/pe/showdetl.cfm?Partnumber=292-430">GRS 8FR-8</a> speakers. The cost for both speakers was under $30.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQPD51FzQwG50BZ_vucBsEXkzRkQDK7fjdrMD7P1eAaN709b7nCTMKXhv1ZCPciTFyVoaUpnTYBviacvKXZqmyzBylUHn2NL_jES5HDGFD27f-LR1JALPG00eDLaiaBcqDiAIEeCcnaY5F/s1600/IMG_4141.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQPD51FzQwG50BZ_vucBsEXkzRkQDK7fjdrMD7P1eAaN709b7nCTMKXhv1ZCPciTFyVoaUpnTYBviacvKXZqmyzBylUHn2NL_jES5HDGFD27f-LR1JALPG00eDLaiaBcqDiAIEeCcnaY5F/s400/IMG_4141.JPG" width="400" /></a></div>
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We used David's 813 amp which we also used in the Russian line stage competition last year. It easily drove all the speakers to loud enough volumes. In fact we were asked to turn down the volume by the library staff at one stage.</div>
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The emphatic winner and liked by all was Steve's MLTLs. They did everything well. The smaller cabinet speakers did really well on the female voice tracks but suffered from the expected lack of bass on the more complicated tracks. Both sets of speakers were designed to be used with subwoofers and I reckon they would sound very good with the extra bass. By comparison, the MLTLs really provided the foundation that some of the music required though some comments noted that some bass notes were a little boomy. One of our test tracks (some incidental music to William Walton's Henry V - Meridian CDE 84349) sounded pretty awful on the small speakers but much better on the larger speakers. It just shows that not all of the test tracks should be of audiophile quality. </div>
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The horns produced mixed reactions. The treble seemed rolled off compared to the other speakers which suited some tracks, but not others. Some liked the mid range but others were not so keen. The bass is definitely there and is probably the best part of the speaker. It's not boomy. I've been looking at the scoring sheets and somebody described the imaging as 'big'. I would agree with that description and this really helped the orchestral music. I'm biased of course, but I think that the difficult Walton track sounded best on these horns. After listening to them for a few weeks now at home where my seat is just 8 feet from the front of the horns, I would say there is a sense of being in a cave with them when you sit directly in front of them. In my house they sound better when I am not in my usual listening position, but off to one side. To me they sounded much better in the larger room where I could sit well away from them. If I were to experiment more with the design in the future, I would add an upward facing tweeter to provide a more airy top end.</div>
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We auditioned the open baffle speakers after we had been asked to turn the volume down so they suffered a little compared to the other speakers. It's a very inexpensive driver and does well in this application with more bass than I expected. However, John was the first to admit that his Visiton B200 speakers sound much better in the same baffle, but their price was above our $200 limit. The GRS mid range did not sound as clear as the other speakers.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLfSIUZVtPUspH-MUNVAWP3KJahltJewv7HaHy8qVhdL-YE23fhTqFJBchoSCkU1r5l0VoRW-40vLVZTePVMdDC6mNPMGUH-DzRLMGM_qPok3WXm1o4S-dZ5OxjRqpdLOklk_8suwda8iB/s1600/IMG_4142.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLfSIUZVtPUspH-MUNVAWP3KJahltJewv7HaHy8qVhdL-YE23fhTqFJBchoSCkU1r5l0VoRW-40vLVZTePVMdDC6mNPMGUH-DzRLMGM_qPok3WXm1o4S-dZ5OxjRqpdLOklk_8suwda8iB/s400/IMG_4142.JPG" width="400" /></a></div>
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Both David and I have built some sand amps as a change of pace. David built a Nelson Pass F5 and I built a <a href="http://www.diyaudio.com/forums/aksa/191053-swordfishy-aspen-fetzilla-power-amp.html">Fetzilla</a> which we tried out later in the day after the competition was over. You can see it on the right hand chair. Perhaps we will listen more to these amps at our October meet. My wife and I inherited a cat and I don't feel comfortable having it walk around my tube amps. </div>
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The horns had to be disassembled and we tried an interesting experiment just before we left. Here is Steve holding the horn in front of his MLTL. Some else did the same on the other speaker. We would listen to some music and at the same moment, the horns would be removed so that we could hear the difference, which was dramatic. We all immediately noticed the expected drop in volume. What I did not expect was the sudden collapse in the sound stage and the loss in richness of the midrange. Somebody had commented after the test of the H frame horns that compared to the other speakers, it seemed like the 'Loudness' button was on. I may have to experiment more with these monsters in the future, but since my wife has been more than patient allowing these monsters into our house, the cones were thrown into the dumpster. Nobody wanted to take them home with them. I did keep the drivers however and I plan to use them in a pair of frugel horns.</div>
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Our next meet will probably be in the second half of October. We've started to think about our competition for next year and it will probably be an amplifier again. We are thinking that it should be a spud amp (one tube per channel) and the tube needs to have a compactron base.</div>
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<br />Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-78330931485316371382012-03-31T06:10:00.003-07:002012-05-14T06:10:55.075-07:00H Frame Horn<div id="General_Content" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">
For our <a href="http://www.bottlehead.com/smf/index.php/topic,1917.0.html">Bottleneck 2012 competition</a>, we decided that we should all build a speaker built around a full range driver. After some discussion we decided that the full range driver could be augmented at the high or low frequencies by a tweeter or woofer. The total cost, including crossover parts if used, would need to be less than $200. Cost of the enclosures was not to be included. The speaker should not just be a copy of an existing design.<br />
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I considered doing something along the lines of the <a href="http://www.quarter-wave.com/Project08/Project08.html">Martin King </a>H frame high qts woofer for the low end and some sort of full range speaker for the mid range and highs. However, it gets difficult to stay under $200 because of the cost of the cross over parts, particularly the inductors. I would thoroughly recommend going to the above link and reading about his various projects, particularly the open baffle H frame projects. If you find the open baffle speakers interesting, you could also read about the <a href="http://www.diyaudio.com/forums/multi-way/110583-fast-fun-inexpensive-ob-project.html">Manzanita</a> which is similar but different to the Martin King concepts.<br />
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After some thought, I remembered an idea I had wondered about years ago to build back to back horns. There would be no compression chamber as usually found in a horn, but in effect it would be an open baffle H frame but in a horn shape. I downloaded the Mathcad software that Martin uses to model his H frames but the package does not want to load on my small netbook for some reason or other. Still, I decided to proceed to see what happened.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQqLeKq0kCliSH09-fFaHqg-rhnS0iptnCXj9YRdyY7RdmJXEjRdI5TP5G16bu13PDiLy4Qt1i-FRpAQL3h3NcQDry1L2Nu3fMnrK5EFNuImNDHiMq6woWxPmWUV74K50bAnr8a9S5rtOU/s1600/IMG_4113.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQqLeKq0kCliSH09-fFaHqg-rhnS0iptnCXj9YRdyY7RdmJXEjRdI5TP5G16bu13PDiLy4Qt1i-FRpAQL3h3NcQDry1L2Nu3fMnrK5EFNuImNDHiMq6woWxPmWUV74K50bAnr8a9S5rtOU/s640/IMG_4113.JPG" width="640" /></a></div>
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<span style="background-color: white;">Here is the finished product in all its glory. Essentially a front cone, a back cone and the full range driver mounted on a sheet of 1/2 inch plywood that I had lying around from a failed project.</span></div>
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Each horn is roughly 32 inches in diameter and 16 inches deep.<br />
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The driver recessed into the plywood. It's a Mark Audio CHR-70 Generation 3 which I <a href="http://www.madisoundspeakerstore.com/approx-4-fullrange/markaudio-chr-70-champaigne-cone-4-full-range/">purchased from Madisound </a>for $36 each. They are nominally 8 ohms, fs 65 hz, qts .55, xmax 4 mm and 85db.<br />
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The 1/2 inch plywood is way too thin and should be at least 3/4 inch. The holes surrounding the speaker are used to mount the polycarbonate to which the cones are attached.<br />
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Before we go much further, I had certain problems designing the speaker that are non sound related. First, I don't have a van to cart the finished product around. To get it to the competition in my car, I need to be able to disassemble the monster and fit four huge cones into the car. I have two in the back seat, one in the front passenger seat and one in the boot (trunk).<br />
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Next the speakers are way too large to sit comfortably in my listening space. Some people might think that they are God awful ugly as well. These were not going to be keepers by any means. In fact, they are disassembled already and hidden away so that guests will not be horrified when they come to our house. I was fortunate that my wife put up with them for a week or more.<br />
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Finally, I am not very good at woodwork.<br />
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Our house had a leak in the roof and I repaired it by replacing a few shingles. In the process I bought a roll of felt roof stuff for a bit under $20 from Home Depot. It's 36 inches wide and as far as I can make out, you get about 72 feet of the stuff. I had oodles left over from the roof repair so I decided to try this stuff.<br />
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Tractix and exponential horns would be out of the question for me to build so I went with simple conical. After some messing around with some small trial models, I finished up with this pattern. The pie piece taken out is approximately 135 degrees. I cut a small hole in the center so that I can turn it into a cone. I kept this piece as a template and cut out extra cones as I needed them. It helps to have a white pencil to stand out against the black of the felt.<br />
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Two more of the ingredients. In the middle is the double sided tape that costs about $5.00. If I were to do this again, it would be cheaper to buy the <a href="http://www.homedepot.com/Scotch/h_d1/N-5yc1vZ3nk/R-100153200/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053">37 foot roll </a>for $16 to allow for mistakes. The smaller roll shown here only has 5 foot of tape.<br />
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The other component is a piece of <a href="http://www.homedepot.com/h_d1/N-5yc1vZ12kx/R-202090134/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053&superSkuId=202939022">polycarbonate</a> (8" x 10" for $4) to which I attach the cone. First I cut a 3 7/8" hole in roughly the middle and drill some smaller holes to mount the polycarbonate (and cone) to the plywood. More about this later.<br />
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The double sided tape ready for the cone to be created. It wasn't all that difficult to form the cone and form the overlap. At this stage, the cone is definitely floppy.</div>
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The cone is now ready for the treatment. First, I placed it on some scrap pieces of felt to protect the deck. The polycarbonate is weighted down by one of those handy pencil holders that you can buy at Ikea. A bit of weight is needed to make sure the cone retains its shape.<br />
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A small level makes sure that the polycarbonate is horizontal.<br />
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The final ingredient. Great Stuff expanding foam. In this case I tried <a href="http://www.homedepot.com/webapp/wcs/stores/servlet/Search?keyword=great+stuff&selectedCatgry=SEARCH+ALL&langId=-1&storeId=10051&catalogId=10053&Ntpc=1&Ntpr=1">Gaps and Cracks </a>for a bit under $4. I had used the<a href="http://www.homedepot.com/webapp/wcs/stores/servlet/Search?keyword=great+stuff&selectedCatgry=SEARCH+ALL&langId=-1&storeId=10051&catalogId=10053&Ntpc=1&Ntpr=1">Windows and Doors </a>($6) and noticed that it excellent glueing properties as well as creating a somewhat rigid foam. Having tried both, I think you can probably get as good results with the cheaper version.<br />
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<span style="color: red;"><strong>Be warned. Read the label before using and wear gloves and eye protection when you use this stuff. If it gets on you then it is very very difficult to get off.</strong></span><br />
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So here is my first attempt. I sprayed first under the polycarbonate to make sure I had plenty of the stuff attaching the polycarbonate to the cone. Then I just kept going around and around until the can ran out. I tried to make sure I got a good amount at the large mouth of the cone. It only takes a few minutes. Unfortunately you need to do all very quickly. If you stop for a few minutes half way the foam stuff clogs in the application tube. I'm sure if you used this foam stuff every day you would get good at getting a steady stream of foam coming out of the application tube. Obviously I don't do this every day and it's all somewhat haphazard. You can tell when you getting close to the end of the can since the volume of foam drops off.<br />
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When done, make sure the polycarbonate is still level and then walk away from it for several hours to let it cure. The foam starts to form a surface very quickly but takes about 8 hours to cure completely.<br />
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I made sure the cones would fit in the car.<br />
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This was my test run with the cheaper foam. The cone was reasonably sturdy and did not flex too much so I created two more cones with the Window and Door foam but after applying the foam I placed about 100 small craft sticks from <a href="http://www.dollartree.com/teachers-supplies/Arts-Crafts-Projects/wood-craft-sticks/208c447c447p299464/index.pro?method=search">Dollar Tree</a> into the foam in various patterns to provide more rigidity. For some reason or other, I don't seem to have a close up photo of the process but if you look closely in the first picture at the top of the page, you can see the sticks.<br />
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I decided to try a sandwich effect with an inner and outer cone with foam in between. I cut out some small blocks of faom about 1/2 inch thick and attached them to the outside of the inner cone with the double sided tape.<br />
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Then I drilled some 1/4 inch holes about half way up the outer cone. The foam applicater tube is not all that long so the holes would allow me to insert foam into the middle area of the cone.</div>
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I then squirted in the foam first at the throat end and then at the mouth. Then into the holes half way up. As you can see, it was a sloppy process and foam leaked all over the place. I then let if overnight to dry.<br />
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Inside the sandwich at the mouth. I would have to say this was not entirely successful and I could feel where there were voids in various areas of the sandwich. However, the sandwich cone was stiffer than the single cone version.<br />
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The following day, I attached the polycarbonate to the cone with an extra can of foam. When it dried, I just cut out the foam in the 3 7/8" hole in the polycarbonate. With sufficient force you can separate the polycarbonate from the foam but it does take some force. There is no danger of the cone falling off the polycarbonate.<br />
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Next I attached the polycarbonate to the plywood with bolts and nuts and connected the speakers. After the recommended 30 hour breakin for the drivers I've been pleasantly surprised by amount of bass coming out of these 4" speakers. I don't have any sophisticated measuring equipment so just used a signal tone generator to see how low it would go. It got down to 30 hz or so but of course the level was way down. Still I was impressed.<br />
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The speakers are way too big for my listening area and they sound much better the further I get away from them compared with my usual relatively closeup listening position. I suspect they might sound half way decent in Steve's room at the actual competition.<br />
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For a few hours I tried the H frame horns in one channel and just the speaker in the plywood in the other channel. There is definite an increase in sound level in the horn version.<br />
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One of the speakers uses two of the single cones and the other speaker uses two of the double (sandwich) cones. To be honest I can't tell the difference between them.<br />
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My wife is a quilter and she uses all of the wall surfaces in our house to display her quilts. She had taken down the usual resident of this blank space so that she could mount a Christmas quilt. Seeing that I had an opportunity, I hung up my original full scale test version. She didn't notice it for about 30 minutes but let's just say that the Christmas quilt is now installed in the place of honour.<br />
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In the foreground is the left over roll of felt. I could get a dozen or more horns out of what's left of that roll. It was a lot of fun working out how to do this and I probably will get additional ideas later on how to stiffen the horns.</div>
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You might have gathered that the cones will be going to the dump after the competition and you would be correct. If I were to keep them, I would keep the single cones and apply more sticks and foam to cover the entire cone. The sandwich idea was ok but too uneven.<br />
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I asked my daughter to review this page to see if it made sense to her. She suggested adding chicken wire to the outside of the cone / foam to see if that improved stiffness. That led me to think about other inexpensive lightweight stiffening methods. Last night I thought of the grate stuff that lies below fluorescent lights. Cut it up into small sections and distribute around the outside into the foam.<br />
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I've also started to think about painting the inside of the cone with something like polyurethane to provide a less sound absorbent surface than the felt. I might also try some Minwax wood hardener.</div>
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I've since tried the Minwax wood hardener and it is marginally effective, but not too much improvement.</div>
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We held the competition which you can read about<a href="http://bottlenecksaudio.blogspot.com/2012/05/full-range-speaker-competition.html"> here</a>. As I suspected, the speakers sounded better sitting further away in a larger room. Opinions were mixed about these speakers. The roll off in the treble was noticeable compared to the other speakers, but in some ways I liked it. I felt these speakers did better than the other entries in the more complex orchestral music. Somebody mentioned that these speakers sounded as if the old 'loudness' button was on. If I were keeping the speakers, I would try adding a tweeter facing upwards between the horns.</div>
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<span style="font-family: Arial, Geneva, sans-serif; font-size: 13px;">Perhaps the most interesting part of the day occurred after I had disassembled the horns. A couple of the guys each held one horn in front of another set of speakers mimicking what I had done but without the backward facing horn. At a signal, the horns were removed quickly and the difference in sound was dramatic. Naturally the volume of sound decreased, but in addition, to my ears, the sound stage became flat and lifeless without the horns. I'm now wondering why.</span><br />
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<span style="font-family: Arial, Geneva, sans-serif; font-size: 13px;">So the speakers were disassembled and the cones put in a dumpster. My wife is very patient with my hobby, but even I know when enough is enough.</span><br />
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</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-178300348161944872012-02-08T11:02:00.000-08:002012-02-08T11:02:03.956-08:00December 2004 meetWe met at the Elkton Library.<br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhy3ttYOOJrAnow2dUjkmgGtsrdZ4ROC2dbmjuWCsVNL0mcQhAus7vJAJNK1gJB0uwQZytVcVpeh3zYLOhPMApzrM4GGsjoCWdbl1hfres2i6zfokE1nljzP8Id4Lxlk1mMPWa2wXIvPM-O/s1600/Dscf0001.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhy3ttYOOJrAnow2dUjkmgGtsrdZ4ROC2dbmjuWCsVNL0mcQhAus7vJAJNK1gJB0uwQZytVcVpeh3zYLOhPMApzrM4GGsjoCWdbl1hfres2i6zfokE1nljzP8Id4Lxlk1mMPWa2wXIvPM-O/s400/Dscf0001.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;">I think these were Thor speakers.</div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgU4Zu0QEuFBIrgZOr4MBxLCNESEOH50p6hCjuIGwxMYknnmWZMXygNbzhYMZ8F7pPerFmoWoHdwg2pvBmhVYKbIHwrzerDCbrJKll8YcsXHu-qEIqT8jl2vxCnLiPQ9iPGUG8lyhwghhKI/s1600/Dscf0002.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgU4Zu0QEuFBIrgZOr4MBxLCNESEOH50p6hCjuIGwxMYknnmWZMXygNbzhYMZ8F7pPerFmoWoHdwg2pvBmhVYKbIHwrzerDCbrJKll8YcsXHu-qEIqT8jl2vxCnLiPQ9iPGUG8lyhwghhKI/s400/Dscf0002.jpg" width="400" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjoqJKTQcrJ17kEM6cv8o5VuFTSdolve72tTnd6iBmyt7mmB6o4AIWysH24kc9ZYd4YDYZpuxKeA6meJcK48I-YeeTmaoh_3xSDwWEMSmnhPxYm72MPyjjt-BxzgQWgbQd_du8Cx0W-hlE1/s1600/Dscf0003.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjoqJKTQcrJ17kEM6cv8o5VuFTSdolve72tTnd6iBmyt7mmB6o4AIWysH24kc9ZYd4YDYZpuxKeA6meJcK48I-YeeTmaoh_3xSDwWEMSmnhPxYm72MPyjjt-BxzgQWgbQd_du8Cx0W-hlE1/s400/Dscf0003.jpg" width="400" /></a></div><div style="text-align: center;"> Ray's 829B amp working in only one channel.</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLounR09Pho6xNYkXsUOa3RwTZvNVLIQc1W1BzATOGqCQA1NfMWf5GcQQMgt_uPwRE_lHL8OjXHXM9lIYdmGZjTCTrGHDGYrUaIpzcrF8e3qGH6rcPWQhBPSBjt_bl5XVVEDzUjqLKBOVy/s1600/Dscf0004.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLounR09Pho6xNYkXsUOa3RwTZvNVLIQc1W1BzATOGqCQA1NfMWf5GcQQMgt_uPwRE_lHL8OjXHXM9lIYdmGZjTCTrGHDGYrUaIpzcrF8e3qGH6rcPWQhBPSBjt_bl5XVVEDzUjqLKBOVy/s400/Dscf0004.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;">Doug's line stage.</div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhoay9jw9tknFNhNWblwhSAhZDrSahWi6I3k6irZDHPAQYFg4dm74tLevT3L-XJhSQORZNyu88Ysm4GCc-nhD-ibhApgriHQxa9dNHZdG05xV6dfsb20Q7UB-FhOrWAGoChnfysB8Hpsj0h/s1600/Dscf0005.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhoay9jw9tknFNhNWblwhSAhZDrSahWi6I3k6irZDHPAQYFg4dm74tLevT3L-XJhSQORZNyu88Ysm4GCc-nhD-ibhApgriHQxa9dNHZdG05xV6dfsb20Q7UB-FhOrWAGoChnfysB8Hpsj0h/s400/Dscf0005.jpg" width="400" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPpAnYJBaHRspCU2LHJAOvevkkYY_0qsYU4JP03MXIXzx9ZCvMXWFcn1b9bfYDKWIAqQMlijZ87C2z7TEhEWio_CcUq5s6rOVbWnrvHEmlywN1CawVSySzf6OAQTqAeWR4b6BaYlLOqOtY/s1600/Dscf0006.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPpAnYJBaHRspCU2LHJAOvevkkYY_0qsYU4JP03MXIXzx9ZCvMXWFcn1b9bfYDKWIAqQMlijZ87C2z7TEhEWio_CcUq5s6rOVbWnrvHEmlywN1CawVSySzf6OAQTqAeWR4b6BaYlLOqOtY/s400/Dscf0006.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;">I seem to remember Randall built this lovely looking amp.</div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgjoAlIpRO3_ccslbGrZFxaWuXDhtQvQ_OJQqKw04PMqH4N73A3qpVfl2e3UI4iJdhCIWPlmTMAwHnivlAnhuIAYaCp6Vw6smkfjmb624N_PBbqgXVWWfBB7bOAquW9ALPawGX6biGnmyNH/s1600/Dscf0007.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgjoAlIpRO3_ccslbGrZFxaWuXDhtQvQ_OJQqKw04PMqH4N73A3qpVfl2e3UI4iJdhCIWPlmTMAwHnivlAnhuIAYaCp6Vw6smkfjmb624N_PBbqgXVWWfBB7bOAquW9ALPawGX6biGnmyNH/s400/Dscf0007.jpg" width="400" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8EHVkgqJVsv96MviLSV3pMvG23VL2kh9bhc3NFjUPN2FAjMcqdeTyQidB2uV4rF3puBF_mhimpWFIyn8P6H2vGZAxSui2fHwLwt83fUbxn9jDRibn5ohzbzrCJdH587QYPObzk-JAO_XK/s1600/Dscf0008.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8EHVkgqJVsv96MviLSV3pMvG23VL2kh9bhc3NFjUPN2FAjMcqdeTyQidB2uV4rF3puBF_mhimpWFIyn8P6H2vGZAxSui2fHwLwt83fUbxn9jDRibn5ohzbzrCJdH587QYPObzk-JAO_XK/s400/Dscf0008.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;">829B amp working. Late in the day it sounded very sweet and airy.</div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkDfoyWOPUm0JJfda1uinpgRoyUGZbvdIQKPlhwwfJWQqFYiLnbdeYndTJzv5mHWHnH7o1hul_q1tcu5pogFYWbaQvp7jeKKQ_iMdEuezVMTXqHVVPz968GFCFee-BZKiTtsTHDt8Glnsj/s1600/Dscf0009.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkDfoyWOPUm0JJfda1uinpgRoyUGZbvdIQKPlhwwfJWQqFYiLnbdeYndTJzv5mHWHnH7o1hul_q1tcu5pogFYWbaQvp7jeKKQ_iMdEuezVMTXqHVVPz968GFCFee-BZKiTtsTHDt8Glnsj/s400/Dscf0009.jpg" width="400" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeH4ezYA_38ZrXuuAbXmEN7KoJ65uGKFjazatH7fc1go2NTBbP45-TMPAJ-s4tDC0UJBwBaOpQgSepTGXFQEbaxF6esKPsYWG9kJpnDUGX304sLhwCovsXlUQswaCPNLuCoDJF32VNXtxj/s1600/Dscf0010.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeH4ezYA_38ZrXuuAbXmEN7KoJ65uGKFjazatH7fc1go2NTBbP45-TMPAJ-s4tDC0UJBwBaOpQgSepTGXFQEbaxF6esKPsYWG9kJpnDUGX304sLhwCovsXlUQswaCPNLuCoDJF32VNXtxj/s400/Dscf0010.jpg" width="400" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3pU3S_rQjMK3YAQPy19mVkgV89s1l_fdE4sC1EDm8rNfXpfD8GfSn8zfsP2I2kZDenaX0Ni8sugaat3lFVHp6tabgRCZjXyRWvLAnmjcN8U9R2k_5egNry8l9Idt91nUfvgQ_5PSsbNma/s1600/Dscf0011.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3pU3S_rQjMK3YAQPy19mVkgV89s1l_fdE4sC1EDm8rNfXpfD8GfSn8zfsP2I2kZDenaX0Ni8sugaat3lFVHp6tabgRCZjXyRWvLAnmjcN8U9R2k_5egNry8l9Idt91nUfvgQ_5PSsbNma/s400/Dscf0011.jpg" width="400" /></a></div><br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtZ0dJclYBB3WGbA17lLOiOM2YmAnqXO32ehhNhT_74F0_EPKV-cwb1csMigN6TWYu4oT2jocpAmuA1L-vNoo9zAihYt04o0qxxQsLO3w5nfzQdJgZu3S67x2L6v6xvYsyjaQ_TXWpXlkZ/s1600/Dscf0013.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtZ0dJclYBB3WGbA17lLOiOM2YmAnqXO32ehhNhT_74F0_EPKV-cwb1csMigN6TWYu4oT2jocpAmuA1L-vNoo9zAihYt04o0qxxQsLO3w5nfzQdJgZu3S67x2L6v6xvYsyjaQ_TXWpXlkZ/s400/Dscf0013.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;">I think this is Mark's chip amp made out of a kettle.</div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIXZN9krzEzlrc-gjN3ftRXUCdGu6XEZY-Jv2Zu7XgXpLDm8PWBOh7bhfN6PevdlH7SjwmTRtWErRFv7riQcyGYJLlcljlEMss3aa9DhQEwSxsw6dazuP1vfszf08uOgwkoS8vokJuoDhC/s1600/Dscf0014.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIXZN9krzEzlrc-gjN3ftRXUCdGu6XEZY-Jv2Zu7XgXpLDm8PWBOh7bhfN6PevdlH7SjwmTRtWErRFv7riQcyGYJLlcljlEMss3aa9DhQEwSxsw6dazuP1vfszf08uOgwkoS8vokJuoDhC/s400/Dscf0014.jpg" width="400" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQYWKE-Y4Dx0KRLlsT7fmhSmfbVrPxt-nvCSsjaFkVZDF1bPZS2oIIYZK8hJ9S2ZtCGL3a2G4NUx2VsF2TrHnwdrOwA2DJpZ8zJDKJdIA9KPqKOWi9-7dk3-0JI2iaQ121UX0X0IA9LNO6/s1600/Dscf0017.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQYWKE-Y4Dx0KRLlsT7fmhSmfbVrPxt-nvCSsjaFkVZDF1bPZS2oIIYZK8hJ9S2ZtCGL3a2G4NUx2VsF2TrHnwdrOwA2DJpZ8zJDKJdIA9KPqKOWi9-7dk3-0JI2iaQ121UX0X0IA9LNO6/s400/Dscf0017.jpg" width="400" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_I_U2zHMGiV1mTuXh-inxQQBN-tBlX0P2FRsdceI_dYQ0RfLtdCeXSOukC1K2OKiZ0-DxMqzDjBxqiwm_bO4JtPQY97l-0DdCUqXdl66B5qofoy_xt4Xk6df9ugF1WKlDpw1bcvPrr2PG/s1600/Dscf0018.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_I_U2zHMGiV1mTuXh-inxQQBN-tBlX0P2FRsdceI_dYQ0RfLtdCeXSOukC1K2OKiZ0-DxMqzDjBxqiwm_bO4JtPQY97l-0DdCUqXdl66B5qofoy_xt4Xk6df9ugF1WKlDpw1bcvPrr2PG/s400/Dscf0018.jpg" width="400" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8fWS5B0kl4Jd6l1ue05kKHEscEm2EbRk3IWpGBIdGbYuRKOgzDQpAyGs07gXLth2RAtSRfb36dVbnrulp__zwrdvvRP_7o4IPdCNjucHjivLRT2PsIEIbkKxxtbsB4JJi0wtS1vfjfspQ/s1600/Dscf0020.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8fWS5B0kl4Jd6l1ue05kKHEscEm2EbRk3IWpGBIdGbYuRKOgzDQpAyGs07gXLth2RAtSRfb36dVbnrulp__zwrdvvRP_7o4IPdCNjucHjivLRT2PsIEIbkKxxtbsB4JJi0wtS1vfjfspQ/s400/Dscf0020.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;">Doug Piccard. He and I got the group started and since he moved out to Detroit we have really missed both his presence and his amps.</div><div class="separator" style="clear: both; text-align: center;"><br />
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-47195999345028310312012-02-08T10:51:00.000-08:002019-06-14T14:06:41.286-07:00May 2003 meetWe met at the Public Library in Elkton, MD. Our patron saint looked on.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxUHbF2zWN0CIrECxQINjnZL52wgGj3_R7EOWIu-P3xtjO7CbZZ8o9yVm41s2tl6NxylQ0rsMNVfyaev86cIU3AC6RtEcLA-8DqMrvBARIFBymSHF9Mwj1GGKZZG9CowPQPekQjQ2yLc7f/s1600/Dscf0114.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxUHbF2zWN0CIrECxQINjnZL52wgGj3_R7EOWIu-P3xtjO7CbZZ8o9yVm41s2tl6NxylQ0rsMNVfyaev86cIU3AC6RtEcLA-8DqMrvBARIFBymSHF9Mwj1GGKZZG9CowPQPekQjQ2yLc7f/s400/Dscf0114.jpg" width="400" /></a></div>
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BK-16's.</div>
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A table of goodies to audition.</div>
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A side table with even more stuff.</div>
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Lovely looking monoblocks that look like 300B's to me.</div>
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The gang.</div>
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Ray's 829B amp with the lightbulbs glowing.</div>
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A great enclosure for a line stage.</div>
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Cake pan amp.</div>
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We tried the BK-16's with a tweeter. Most felt the combo worked better.</div>
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This looks like one of Doug's push pull creations.</div>
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<span style="background-color: white; text-align: start;">PP HY69's. Cascode triode LTP input stage that is running E-Linear FB. The linestage above it is a 12B4 circuit with an all-tube active load and a regulated PS</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEija8mNyS504xgNT-rYUyuGV3R03ytjN4es40M-SmDxi7Os8HGAM55932FI2aKe7Nm9juukSur9drPsrDUSnpGdsMdsjgccJe6iRb8XIMhIFYsmZ_zz4X0YJ3B5rV-lpOkbLXjYmJu09Vhm/s1600/MVC-005S.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEija8mNyS504xgNT-rYUyuGV3R03ytjN4es40M-SmDxi7Os8HGAM55932FI2aKe7Nm9juukSur9drPsrDUSnpGdsMdsjgccJe6iRb8XIMhIFYsmZ_zz4X0YJ3B5rV-lpOkbLXjYmJu09Vhm/s400/MVC-005S.JPG" width="400" /></a></div>
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I think this is a Bottlehead Foreplay / Seduction combo.</div>
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Closeup of the 829B amp.</div>
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The taste tester line stage made a reappearance.</div>
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It's almost nine years since this meet so you will have to excuse my poor memory of what all these magic devices were.</div>
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-57539827544442537592012-02-08T10:05:00.000-08:002012-02-08T10:05:31.200-08:00June 2007 meetWe met at Steve's place.<br />
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</div><div class="separator" style="clear: both; text-align: center;">Some Fostex speakers.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">I can't remember what these amps were.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">Some open baffle speakers. They were intriguing.</div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgEqIciifeSbibaJzDI-SfVNlikXwWylZPLr2SUbEMybC96GTeh-aDzuGA0mNvy_rCUwmvilwmMYshJX0XtB2hgwEqTnxdHsxilX0BbaBNkW2lFqDuKlt2XU2u45T_Ho-6USgevsRqQiaSP/s1600/IMG_1191.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgEqIciifeSbibaJzDI-SfVNlikXwWylZPLr2SUbEMybC96GTeh-aDzuGA0mNvy_rCUwmvilwmMYshJX0XtB2hgwEqTnxdHsxilX0BbaBNkW2lFqDuKlt2XU2u45T_Ho-6USgevsRqQiaSP/s400/IMG_1191.JPG" width="300" /></a></div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;">My daughter Robin built this <a href="http://www.audiotropic.net/Products/machine.html">Poinz Music Machine</a> when she was about 18. I wanted her to learn how to solder and also to learn something about electricity. She did a much neater job on the wiring that I ever could, but then again she is a really good knitter.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">The large baffle speakers on the right are <a href="http://www.hawthorneaudio.us/speakers.html">Hawthornes</a> if I remember correctly.</div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjngPh7LfrgiP3_JHKDBOu8EUeWQuDpe9nbctneENVsxByBqMoYeN0m3-YsknBC2xPsfSs4v78HMltMtS7qBfYT_UIWgGVn_o4HxGGifTI2PVgkyrnAuGuDeT7XtZqZKwrxb3F-OEEMKZ6Z/s1600/IMG_1193.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjngPh7LfrgiP3_JHKDBOu8EUeWQuDpe9nbctneENVsxByBqMoYeN0m3-YsknBC2xPsfSs4v78HMltMtS7qBfYT_UIWgGVn_o4HxGGifTI2PVgkyrnAuGuDeT7XtZqZKwrxb3F-OEEMKZ6Z/s400/IMG_1193.JPG" width="300" /></a></div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;">Steve's fence post speakers. They delivered an amazing amount of bass for such a small driver.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">I can't remember what these older speakers were but I seem to remember they were British. I do remember they sounded very mellow and pleasant.</div><div class="separator" style="clear: both; text-align: center;"><br />
</div>Unknownnoreply@blogger.com1tag:blogger.com,1999:blog-836411969057354995.post-54808711179733139482012-02-08T09:48:00.000-08:002012-02-08T09:48:05.289-08:00December 2005 meetWe met at Randall's place.<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLByCrhve7p8B_T4V_KJ7bZU6RDWqpb5ONXzaw5xcrxwlpLjn7vyqYwWUroKh38-7pP0PFc9wczOMut3SH9LE1RvfpOlV2il5ZFOIof2V6qpJOuIqW_0pAQPjOMO2y2aqN-96MlWIMXW-i/s1600/IMG_0247.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLByCrhve7p8B_T4V_KJ7bZU6RDWqpb5ONXzaw5xcrxwlpLjn7vyqYwWUroKh38-7pP0PFc9wczOMut3SH9LE1RvfpOlV2il5ZFOIof2V6qpJOuIqW_0pAQPjOMO2y2aqN-96MlWIMXW-i/s400/IMG_0247.JPG" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;">This seemed to be a meet where we had more speakers rather than amps. However, you can see a little T amp that I seem to remember Tony brought along.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">Fostex drivers were plentiful.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">Randal had bought a bunch of 99 cent Parts Express 4" speakers and mounted them in an array.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">The only one who could hear the really high frequencies.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">Some of the gang.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">Looks like a 300B tube to me. Most of our amps are single ended.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">A joke loudspeaker.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">More detail of the arrays. I also had some of these speakers but they were not the equal of an earlier Parts Express closeout speaker, <a href="http://www.parts-express.com/projectshowcase/budget_bookshelf.html">the 269-469</a>. I've used these in arrays for years and really like them.</div><br />
<div class="separator" style="clear: both; text-align: center;"></div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-13341544352497150272012-02-08T09:23:00.000-08:002012-02-08T09:25:30.279-08:00January 2003 meet<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtnt6Sb62Xj6hd_ik50SYkab3S00I5Ii6RDBEPjUj3JEDI_I3Xtc6j2hRYww-1LqN6BRuMZxc2pLXJC9QU5_bZl6J5GY4PkEd2WatwloACRg9FV6cCJXPwmo5wWZJw9NmG0gTr460zvEpZ/s1600/image001.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtnt6Sb62Xj6hd_ik50SYkab3S00I5Ii6RDBEPjUj3JEDI_I3Xtc6j2hRYww-1LqN6BRuMZxc2pLXJC9QU5_bZl6J5GY4PkEd2WatwloACRg9FV6cCJXPwmo5wWZJw9NmG0gTr460zvEpZ/s400/image001.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;">I think this was one of our first meets. As I remember these are Doug's Electrovoice speakers with some sort of horn tweeter on top.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">Somebody's Foreplay. Much nicer than my build.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">Straight Eights.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">Crossover for the Straight Eights.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">Ray's tube taster line stage. It was a parafeed designed to be able to switch easily and quickly between a bunch of tubes - 76, 6SN7, 5695, 6N1P and 5847. It was very easy to tell the tonal differences between the tubes and I found that different tubes went better with different music.</div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;">It won the 'God awful looking' prize.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">Ray's first tube amp. A parafeed version of a 6BM8 <a href="http://www2u.biglobe.ne.jp/~hu_amp/6bm8a_e.htm">Super Triode</a> amp. We played it later in the day and as I remember, we thought it sounded quite pleasant.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">The room we used is in a corner of the Elkton, MD Public Library. You can't hear the music from the rest of the library so patrons are not disturbed. Late in the day, one of the library staff came in to have a listen. She seemed to really enjoy the music.</div><br />
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</div><div class="separator" style="clear: both; text-align: center;">One of Doug Piccard's push-pull monoblocks. They weighed a ton but really sounded great.</div><br />
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</div><div style="text-align: center;">We had a lot of equipment to listen to and it really was a great start for our group.</div><div style="text-align: center;"><br />
</div>Unknownnoreply@blogger.com1tag:blogger.com,1999:blog-836411969057354995.post-32551491510742368162012-02-08T09:03:00.000-08:002012-02-08T09:03:40.264-08:00Russian Line Stage Competition<div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><strong>Objective: </strong>to build an inexpensive stereo line stage based on a Russian tube. Participants may use any design, but the design must incorporate one or more tubes from Russia that the signal passes through. The power supply may be driven by 117 VAC, a wall transformer (AC or DC) or battery.</span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><span style="font-size: small;"><strong>The Place: </strong>David's place in Reston, VA.</span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><span style="font-size: small;"><strong>The Date:</strong> Saturday April 2, 2011. Contestents should arrive with their linestages between 10am and 11 am for testing to ensure they work.</span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><span style="font-size: small;"><strong>Photos</strong> of the entries can be seen <a href="http://829b.com/linestagephotos.aspx">b</a>elow. David's 6N3P entry was the winner.</span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><strong><span style="font-family: Arial, Geneva, sans-serif; font-size: medium;">Building your own line stage is very dangerous, particularly with the high voltages involved. We will not be held responsible for any injuries caused by you building your line stage. This competition is not for novice builders. We highly recommend that novices build one or more <a href="http://www.bottlehead.com/et/et.html">Bottlehead kits </a>before considering a scratch build like this.</span></strong></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-family: 'Times New Roman', serif; font-size: 12pt;"><span style="font: normal normal normal 7pt/normal 'Times New Roman';"><span style="font-size: small;"> </span></span></span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial; font-size: small;">1. We will <u>not</u> accept entries that are shipped to the competition. <u>You need to carry the line stage in through the door at the competition.</u> If you live in another part of the country, you might consider holding a similar competition in your own region. Our committee decided we did not want to be responsible for items that were shipped to us.</span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">2. Cost of components shall be $100 or less including the tubes, sockets, rca jacks, batteries and fuse/power receptacles. All of the tubes used in the design should have Russian markings on them. </span></span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">3. Screws, bolts, nuts, wire, washers, lock washers, shrink wrap, cable ties, glue, adhesives and solder etc. are the only items not to be included in the $100. If in doubt, include the item in your $100. </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">Do not include postage / shipping costs from the vendors in the $100.</span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: medium;">4</span>.<span style="font: normal normal normal 7pt/normal 'Times New Roman';"> </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">You may use any other Russian tubes you like for rectifier, regulation, etc. Using other Russian components such as capacitors is encouraged. You may also use sand in the driver circuit. Try to be innovative and use some techniques you haven't tried before. Have fun.</span></span></span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">5. For safety reasons, the 117VAC line stages will include an IEC connector, an on-off switch, a fuse, at least one power transformer and a bleeder resistor. The wall transformer and battery powered line stages should have an on-off switch, fuse and bleeder resistor. </span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial; font-size: small;">6. All batteries will be enclosed and not be able to be touched from the top or sides.</span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">7. A schematic and a list of all materials with part numbers and pricing needs to accompany the amplifier. Pricing shall be based on the quantity of parts shown on the schematic or, if greater, the minimum buy quantity. Other than the tube(s), components, both passive and active, may be sourced from any vendor such as: Allied, Digikey, Mouser, Antique Electronic Supply, Radio Shack, Edcore, Antek and Parts Express. Components may also be purchased from Ebay vendors, but no </span><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">component should be made from unobtanium.</span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">8. You may use parts you already own, provided each exact part is currently available in a catalog or commonly found on Ebay. Discontinued items should not be used. The intent is that somebody else could come along and build your design using the schematic and the list of all materials for the same price. As an example,<span style="font-family: Arial, Geneva, sans-serif;"> </span><span style="font-family: Arial, Geneva, sans-serif;"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; border-collapse: collapse; font: normal normal normal 13px/normal arial;"><span style="font-size: small;">I happen to have a 22uf 450 volt <span style="font-family: Arial, Geneva, sans-serif;">Nichicon capacitor laying around. I can use it provided that I can still buy that particular exact same cap at Mouser and I can show the part number </span></span><span style="border-collapse: collapse; font-family: Verdana;"><span style="font-size: x-small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">647-UCA2W220MHD6 and the current cost ($1.35).</span></span></span></span></span></span></span></span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: 10pt;"><span style="font-family: Arial; font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">9. Pricing of parts will probably rise in the course of a year. The pricing of the parts for the winning entry will be checked against the online catalogs. If the cost for the winning entry exceeds $100, it will be disqualified. One approach is to design for $90 which would allow $10 headroom for price increases. </span></span></span></span></span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">10.<span style="font: normal normal normal 7pt/normal 'Times New Roman';"> </span></span></span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">Just for the fun of it, the case should come from <u><strong>Target</strong></u>. Be imaginative. Spend what you like on the Target stuff for the casework, but no Target stuff is to be used for electrical purposes.</span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><br />
</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: small;">11</span>.<span style="font: normal normal normal 7pt/normal 'Times New Roman';"> </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">All line stages shall be evaluated using the same source, amplifier and speakers. The input impedence of the amplifier to be used will be announced later. Presume at least 47k. The cables will not exceed 1 meter in length.</span></span></span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">12. You should include RCA jacks for both input and output. You should also include a volume control. </span> </span></span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: small;">13</span>.<span style="font: normal normal normal 7pt/normal 'Times New Roman';"> </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">All line stages shall be evaluated using a compilation of music on one CD. The selection will be eclectic and include classical, blues and other genres. Typically, the music will be from CDs that have been enjoyed at our regular meets. David will be picking the music.</span></span></span></span></span></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><br />
</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: small;">14</span>.<span style="font: normal normal normal 7pt/normal 'Times New Roman';"> </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">We will provide a simple prize, possibly some little plate you can attach to your line stage that you can treasure for the rest of your days.</span></span></span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">15. We will probably judge the entries based on how we did it for the 6V6 competition. </span></span></span></span></div><div class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; line-height: 15pt; margin-left: 0.25in; text-align: left; text-indent: -0.25in;"><br />
</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;"><strong>Set up:</strong></span></span></span></span></div><ul style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; list-style-position: inside !important; margin-bottom: 0.3em; margin-top: 0.3em; text-align: left;"><li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">As much as possible, the same setup and positioning for all equipment(CD player/DAC/line stage/amplifier/speakers/cables/power cable) including positioning of the line stage on whatever support we use.</span></span></span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">A single CD with the music selections preceded by a test tone at roughly 440 hz to set the volume.</span></span></span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">All line stages to be invisible to the audience, even while not playing.</span></span></span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">All line stages will be numbered. The order of playing the line stages will be drawn from a hat.</span></span></span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">One designated person and a helper to be responsible for hooking up each line stage. These persons will not take part in the scoring.</span></span></span></span></li>
</ul><span style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;"><div><br />
</div></span><div><span style="font-size: small;"><strong>The judges:</strong></span></div><ul style="list-style-position: inside !important; margin-bottom: 0.3em; margin-top: 0.3em;"><li><span style="font-size: small;">Depending on the number of entries, we may need to limit the number of judges at the discretion of the organizers.</span></li>
<li><span style="font-size: small;">If the number of judges is limited, priority will be given to those who regularly attend our Bottleneck meetings.</span></li>
<li><span style="font-size: small;">Each judge will be presumed to have either cloth or tin ears.</span></li>
</ul><div> </div><div><span style="font-size: small;"><strong>The judging process:</strong></span></div><ul style="list-style-position: inside !important; margin-bottom: 0.3em; margin-top: 0.3em;"><li><span style="font-size: small;">Each judge to be given a score card (and pencil) and will sit in an assigned chair throughout the contest.</span></li>
<li><span style="font-size: small;">No discussion while music is playing or for 30 seconds thereafter when the score must be written down.</span></li>
<li><span style="font-size: small;"> There will be a preliminary round where all line stages are auditioned. The top three line stages will go on to a final round with a different music selection.</span></li>
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<tr><td class="MS_MasterLeftNav" id="IWS_WH_Elem_LeftNav" nowrap="true" style="background-attachment: initial; background-clip: initial; background-color: #cccc99; background-image: initial; background-origin: initial; font-size: 10pt; vertical-align: top; width: 0px;"></td><td class="MS_MasterBody" style="background-attachment: initial; background-clip: initial; background-color: white; background-image: initial; background-origin: initial; font-size: 10pt; vertical-align: top;"><div class="MSC_Body" id="IWS_WH_Elem_Content" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; height: 8516px; padding-bottom: 10px; padding-left: 10px; padding-right: 10px; padding-top: 10px; text-align: left;"><div id="IWS_WH_ZoneRowContainer"><table class="MS_WH_ZoneRow" style="width: 760px;"><tbody>
<tr><td class="MS_WH_ZoneSpacing" colspan="1" rowspan="1" style="font-size: 10pt; width: 6px;"></td><td colspan="1" rowspan="1" style="font-size: 10pt; width: 735px;" valign="top"><div class="MS_WH_ZoneContent" style="overflow-x: hidden; padding-bottom: 3px; padding-left: 3px; padding-right: 3px; padding-top: 3px;"><div id="General_Content"><img src="http://829b.com/images/img_8694.jpg" /></div><div> </div><div>The listening setup. We used the Art Arrays for the actual competition fed by Paramours. The line stages were hidden off in another room so that we could not see them.</div><div> </div><div>This photo was taken later in the day after the competition was over and we were relaxing. The top speakers are Jordans with a ribbon tweeter. Below that are the Wharfedale Diamonds which were part of the under $300 system. Then we also listened to some old Spicas which really did sound good.</div><div> </div><div><img src="http://829b.com/images/img_8688.jpg" /></div><div> </div><div><img src="http://829b.com/images/img_8689.jpg" /></div><div> </div><div>Deb's 6N6P cake pan entry. I loved the look of this.</div><div> </div><div><img src="http://829b.com/images/img_8690.jpg" /></div><div> </div><div>Deb's upmarket version of the same circuit. It sounded much better than her other version, probably because it had better caps and it had been properly broken in.</div><div> </div><div><img src="http://829b.com/images/img_8693.jpg" /></div><div> </div><div><img src="http://829b.com/images/img_8692.jpg" /></div><div> </div><div><img src="http://829b.com/images/img_8691.jpg" /></div><div> </div><div>David's winning 6N3P entry, niftily enclosed in a radio box. Yes, you could buy the <a href="http://www.target.com/Crosley-Traveler-Radio-Tweed-CR21/dp/B0000DHVOK/ref=sc_qi_detaillink">Crosley Radio </a>at Target and David stripped the innards out and used the rest of it. I seem to remember he said it was on sale.</div><div> </div><div><img src="http://829b.com/images/img_8681.jpg" /></div><div> </div><div>Ray's 6N6P entry. The rectifier tubes are 6AX4's.</div><div> </div><div><img src="http://829b.com/images/img_8682.jpg" /></div><div><br />
</div><div><img src="http://829b.com/images/img_8683.jpg" /></div><div><br />
</div><div><img src="http://829b.com/images/img_8685.jpg" /></div><div> </div><div>Ray's 6S17K-V entry. You can read more about it <a href="http://audioratbag.blogspot.com/2012/02/russian-line-stage-6sk17k-v.html">here</a>.</div><div> </div><div><img src="http://829b.com/images/img_8695.jpg" /></div><div><img src="http://829b.com/images/img_8697.jpg" /></div><div><img src="http://829b.com/images/img_8696.jpg" /></div><div> </div><div>Tony's under $300 system. The speakers are Wharfedale Diamonds and the amp is digital. It sounded amazingly good but John's 45 amp that came immediately after we played the digital amp showed why we build with tubes.</div><div> </div><div><img src="http://829b.com/images/img_8698.jpg" /></div><div> </div><div>At the end of the day we played David's 813 amp. I was too tired to really form an opinion about it it, but I liked what I heard and I certainly would like to hear it again sometime.</div><div> </div><div>The competition was certainly a lot of fun. Certainly these Russian tubes are really good and they are so inexpensive. I think all of the tubes used cost under $3 a piece.</div></div></td></tr>
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</tbody></table></div></span></span></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-31539530409487011342012-02-08T08:58:00.001-08:002015-01-23T05:55:51.063-08:006V6 Competition<div align="center" class="MsoNormal" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px;">
<strong><span style="font-size: medium;">6V6 Competition - Results</span></strong></div>
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<span style="font-size: small;">The competition was held at Steve's place on April 11, 2010</span></div>
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<span style="font-size: small;">The first round results were very close. Unfortunately, both Jim and Ray's amps only worked in one channel. The final round resulted in a clear win for John's amp. All of the amps were excellent and we can highly recommend using the triode 6V6 as an output tube.</span></div>
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<span style="font-size: small;">Pictures and schematics (if available) can be seen below at the bottom of this post.</span></div>
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<span style="font-size: small;">Ray's amp won the Ikea prize.</span></div>
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<span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><strong>February 25 Update</strong></span></div>
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<span style="font-size: small;">Amps to arrive in the 10am - 11 am period, preferably closer to 10am</span></div>
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<span style="font-size: small;">Since nobody is building a Push Pull 6V6 amp, I will bring the <a href="http://www.audiotropic.net/Products/machine.html">Poinz Music Machine </a>that my daughter built to see if we can pick it out from all the SE amps - the amp will not be eligible for the prize</span></li>
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<span style="font-size: small;">Each amp to be turned on and tested prior to 11 am to ensure that each amp works and the offical tester knows how to do it</span></div>
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<span style="font-size: small;">Each amp to be given a name eg 'The Devastator'</span></div>
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<span style="font-size: small;">The order of audition will be random</span></div>
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<span style="font-size: small;">Everybody to be seated in their allocated chair by 11am</span></div>
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<span style="font-size: small;">Ray to supply scorecards and explain the rules</span></div>
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<span style="font-size: small;">First audition will be a short test run with the PP amp to get people used to the music and the judging procedure - that amp will be repeated later in the competition</span></div>
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<span style="font-size: small;">Each audition in first round to have about 20 minutes of music (6 tracks)</span></div>
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<span style="font-size: small;">Scoring to be be completed at end of each audition</span></div>
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<span style="font-size: small;">Short break between auditions (hopefully we can do one amp every 30 minutes)</span></div>
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<span style="font-size: small;">Slightly longer break at the end of the third amp for lunch</span></div>
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<span style="font-size: small;">At end of first round, the top three entries to continue (or two if we are running short of time)</span></div>
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<span style="font-size: small;">Fewer tracks in the second round</span></div>
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<span style="font-size: small;">Ray to present prizes for Best of Competition and The Ikea Award</span></div>
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<span style="font-size: small;">Event to finish at 4pm ( Ray flies to UK from Dulles at 18:40)</span></div>
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<li><span style="font-size: small;">No food or drink in listening area</span></li>
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<li><span style="font-size: small;">Send me an email if you need directions to Steve's place</span></li>
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<span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><strong>January 3 Update:</strong></span></div>
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<span style="font-family: Arial, Geneva, sans-serif; font-size: small;">The competition will be held on Sunday, April 11. The starting time has not been set in stone, but plan on 10 am.</span></div>
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<span style="font-family: Arial, Geneva, sans-serif; font-size: small;">If you are planning to submit an entry, please send me an email by February 1 which will be the cutoff date for entries. We have no idea how many entries we will have to allow auditioning time for, so we need to use this cutoff date for planning purposes. There is no entry fee.</span></div>
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<span style="font-family: Arial, Geneva, sans-serif; font-size: small;">I have an email account at gmail. Please use rperry13 and I will acknowledge your email with directions to Steve's place in Stirling, VA.</span></div>
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<span style="font-size: small;">If you plan to attend but are not going to submit an entry, it would be helpful to send me an email prior to the competition so that we have an idea of how many people are turning up. There is no cutoff date for non competing attendees.</span></div>
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<span style="font-size: small;">Please review the rules below, particularly rule 1 about carrying your amp in the door.</span></div>
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<span style="font-size: small;">According to rule 7, there is no need to submit your schematic and parts list until the day of the contest, but for planning purposes, when you send me the email, could you let me know if the amp is single ended or push-pull.</span></div>
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<span style="font-family: Arial, Geneva, sans-serif; font-size: small;">Again, I thank all those who have made suggestions. </span></div>
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<span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><strong>Objective: </strong>to build an inexpensive stereo amplifier based on a common output tube, the 6V6. Participants may use any design, single ended, push-pull, whatever, including two or four 6V6’s. The use of driver tube(s) is optional and at the discretion of the builder but the output tubes must be 6V6's.</span></div>
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<span style="font-size: small;"><strong>The Place: </strong>Stirling, VA (near Dulles airport)</span></div>
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<span style="font-size: small;"><strong>The Date:</strong> Sunday, April 11 2010. Kickoff probably at 10am.</span></div>
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<strong><span style="font-family: Arial, Geneva, sans-serif; font-size: medium;">Building your own amplifier is very dangerous, particularly with the high voltages involved. We will not be held responsible for any injuries caused by you building your amplifier. This competition is not for novice builders. We highly recommend that novices build one or more <a href="http://www.bottlehead.com/et/et.html">Bottlehead kits </a>before considering a scratch build like this.</span></strong></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial; font-size: small;">1. After considerable thought, our committee decided we will <u>not</u> accept entries that are shipped to the competition. <u>You need to carry the amp in through the door at the competition.</u> If you live in another part of the country, you might consider holding a similar competition in your own region. Our committee decided we did not want to be responsible for items that were shipped to us.</span></span></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">2. Cost of components shall be $200 or less including the tubes, sockets, chassis, rca jacks, binding posts and fuse/power receptacles. Each 6V6 will be priced at $8.95 which is the cheapest in the AES catalog. We will use a more expensive set of matched 6V6's at the competition that will be used to audition all entries. For the other tubes, you may use your own special NOS tubes, but use the lowest pricing from the AES catalog. The model number of all tubes should appear in the AES catalog.</span></span></span></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">3. Screws, bolts, nuts, wire, washers, lock washers, shrink wrap, cable ties, glue, adhesives and solder etc. are the only items not to be included in the $200. If in doubt, include the item in your $200. </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">Do not include postage / shipping costs from the vendors in the $200.</span></span></div>
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<span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: medium;">4</span>.<span style="font: normal normal normal 7pt/normal 'Times New Roman';"> </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">The design shall be based on the 6V6 used as an output tube. You may use any other tubes you like for input, rectifier, regulation, etc. Sakuma 6V6 - 6V6 style amps will be acceptable. You may also use sand in the driver circuit. Try to be innovative and use some techniques you haven't tried before.</span></span></span></span></div>
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<span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: small;">5.<span style="font: normal normal normal 7pt/normal 'Times New Roman';"> </span></span></span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">The amp can be any class you like - single ended, push pull, class A, class AB, class B, class C, triode, ultralinear, etc</span>.</span></span></span></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">6. For safety reasons, the amplifier will include an IEC connector, an on-off switch, a fuse, at least one power transformer and a bleeder resistor. No wiring carrying more than 1 volt (AC or DC) should be able to be touched from the top or sides. Plate dissipation for each 6V6 should not exceed 14 watts.</span></span></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">7. A schematic and a list of all materials with part numbers and pricing needs to accompany the amplifier. Pricing shall be based on the quantity of parts shown on the schematic or, if greater, the minimum buy quantity. Components, both passive and active, must be current catalog items sourced from any vendor with a commonally available catalog that can be accessed using the internet. Examples are: Allied, Digikey, Mouser, Antique Electronic Supply, Radio Shack, Edcore, Antek and Parts Express. Components purchased from Ebay vendors, are prohibited. </span><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">No component should be made from unobtanium.</span></span></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">8. You may use parts you already own, provided each exact part is currently available in a catalog. Discontinued items should not be used. The intent is that somebody else could come along and build your design using the schematic and the list of all materials for the same price. As an example,<span style="font-family: Arial, Geneva, sans-serif;"> </span><span style="font-family: Arial, Geneva, sans-serif;"><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; border-collapse: collapse; font: normal normal normal 13px/normal arial;"><span style="font-size: small;">I happen to have a 22uf 450 volt <span style="font-family: Arial, Geneva, sans-serif;">Nichicon capacitor laying around. I can use it provided that I can still buy that particular exact same cap at Mouser and I can show the part number </span></span><span style="border-collapse: collapse; font-family: Verdana;"><span style="font-size: x-small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">647-UCA2W220MHD6 and the current cost ($1.28).</span></span></span></span></span></span></span></span></span></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: 10pt;"><span style="font-family: Arial; font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">9. Pricing of parts will probably rise in the course of a year. The pricing of the parts for the winning entry will be checked against the online catalogs. If the cost for the winning entry exceeds $200, it will be disqualified. One approach is to design for $190 which would allow $10 headroom for price increases. Do not use 'sale' prices.</span></span></span></span></span></span></div>
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<span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">10.<span style="font: normal normal normal 7pt/normal 'Times New Roman';"> </span></span></span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">Just for the fun of it, the case should come from Ikea. Be imaginative. When we were first thinking about this competition, we thought the IKEA cost should be included in the $200 but on second thoughts, it would be more fun to see what our imaginations can come up with. So spend what you like on the IKEA stuff for the casework, but no IKEA stuff is to be used for electrical purposes.</span></span></div>
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<span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: small;">11</span>.<span style="font: normal normal normal 7pt/normal 'Times New Roman';"> </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">All amps shall be evaluated using the same tubes, preamp, cd player, speakers. We currently expect to listen to the amps at Steve’s place in Stirling, VA using his 95db efficient </span><a href="http://audiokarma.org/forums/showthread.php?p=1856214#post1856214"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">Econowave</span></a><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"> speakers with JBL 14A woofers and the Selenium D220 wave guide loaded drivers which are 8 ohms. At our last meet, we felt that the JBL was not quite efficient enough so we may change the woofer.</span></span></span></span></div>
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<span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-size: small;">13</span>.<span style="font: normal normal normal 7pt/normal 'Times New Roman';"> </span></span><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;">All amps shall be evaluated using a compilation of music on one CD. The selection will be eclectic and include classical, blues and other genres. Typically, the music will be from CDs that have been enjoyed at our regular meets. </span></span></span></span></span></div>
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<span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Verdana, sans-serif; font-size: 10pt;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">15. We are still considering how to judge the entries. The following may change prior to April 11.</span></span></span></span></div>
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<span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;"><strong>Set up:</strong></span></span></span></span></div>
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<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">As much as possible, the same setup and positioning for all equipment(CD player/DAC/Foreplay/ speakers/cables/power cable) including positioning of the amp on whatever support we use.</span></span></span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">A single CD with the music selections preceded by a test tone at roughly 440 hz to set the volume with some kind of sound meter in a fixed position.</span></span></span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">All amplifiers to be invisible to the audience, even while not playing.</span></span></span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">All amps will be numbered. The order of playing the amps will be drawn from a hat.</span></span></span></span></li>
<li><span style="font-family: Arial, Geneva, sans-serif;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">One designated person to be responsible for hooking up each amp. This person will not take part in the scoring.</span></span></span></span></li>
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<span style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;"><strong>The judges:</strong></span></span></span></span></div>
<ul style="list-style-position: inside !important; margin-bottom: 0.3em; margin-top: 0.3em;">
<li><span style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">Depending on the number of entries, we may need to limit the number of judges at the discretion of the organizers.</span></span></span></span></li>
<span style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;">
<li><span style="font-size: small;">If the number of judges is limited, priority will be given to those who regularly attend our Bottleneck meetings.</span></li>
<li><span style="font-size: small;">Each judge will be presumed to have either cloth or tin ears.</span></li>
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<span style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;"><strong>The judging process:</strong></span></span></span></span></div>
<ul style="list-style-position: inside !important; margin-bottom: 0.3em; margin-top: 0.3em;">
<li><span style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><span style="font-size: small;"><span style="font-family: Arial, Geneva, sans-serif; font-size: small;"><span style="font-size: small;">Each judge to be given a score card (and pencil) and will sit in an assigned chair throughout the contest.</span></span></span></span></li>
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<li><span style="font-size: small;">No discussion while music is playing or for 30 seconds thereafter when the score must be written down.</span></li>
<li><span style="font-size: small;">The scoring system is not yet finalized but a sample can be seen <a href="http://829b.com/6V6competitionscoringsystem.aspx">here</a></span></li>
<li><span style="font-size: small;"> There will be a preliminary round where all amplifiers are auditioned. The top three amps will go on to a final round with a different music selection.</span></li>
<li><span style="font-size: small;">Each of the three members of the organizing committee will select two short tracks (or excerpts)for each of the preliminary and final rounds. If there are a lot of entries and we are short on time, we may restrict the number of tracks to be played. The list will be published prior to the competition. Between us, we will cover different styles of music.</span></li>
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John's winning entry used a cake pan.</div>
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In the schematic, The power transformer is an Edcor XPWR013, L1 & L2 are the primary & secondary of the Edcor GXSE10-8-5k</div>
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David's entry used a wooden tray and pencil holders.</div>
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Fritz's entry used a child's push trolley. The amp is on the lower level and used a Dynaco chassis with the cover not shown in the photo. Fritz also mounted his linestage on the upper level, which is really clever.</div>
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Jim's entry used a tray. The amp was working the night before but there was a problem with a capacitor that affected the small input tube. </div>
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Joel's entry used a cake pan </div>
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Ray's entry used a candle holder. More about this amp <a href="http://audioratbag.blogspot.com/2012/02/lumiere.html" target="_blank">here</a>.</div>
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The lightbulbs are used as plate resistors. The amp worked fine during the warm up test and then failed for the first time since the amp was built. The cause of failure was a screw to hold one of the 2SK3564's to the heatsink had loosened with all the jolting on the two hour trip down from where I live. I now use a dab of nail polish to keep the nuts tightened.</div>
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-49162052269041284752012-02-08T08:54:00.001-08:002012-02-08T08:54:42.958-08:00October 2010<div id="General_Content" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Five of us met at Fritz's house in Newark, Delaware. We started off listening to Fritz's 6V6 amp from the <a href="http://829b.com/6v6entries.aspx">competition</a> and his Fostex BK16's. Fritz had made some minor changes to his amp's power supply to improve separation and his amp and speakers were a treat to listen to.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">A new member, Don, turned up with some beautiful Western Electric push pull 6V6 amps.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/we1.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/we2.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Except for the wooden casing, they are apparently pretty much original. I loved these amps and could have listened to them much longer, particularly on band music. Vocals sounded more involving on the single ended amps, but these amps impressed everybody.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/lightbulb.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">After the flop at the competition, my 6V6 entry made a belated appearance and actually worked fine this time. It has settled down a bit and keeps improving with use. I suspect it is the cheap Antek toroid transformers that I use as output transformers which are gradually improving. Inside there are a couple of switches I can flip to switch between using the light bulbs as a parafeed plate load and some 5k Dale wirewound resistors. Everybody could hear the difference between them though preference was mixed. I preferred the lightbulbs at home and the resistors at the meet. To me, the bulbs are more euphonic, if that is the correct word. Most agreed that the bass was more pronounced on this amp than some of the other competition entries. If you want to try the toroids for fun, they are Antek AN0209 ($11 each). Wire the 115 in series and the 9 in parallel and use as parafeed. The amp uses a 12HG7 as input and also has <a href="http://tubelab.com/PDcookbook.htm">Tubelab's Powerdrive</a>.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">We have all been impressed by the quality of sound that the 6V6 amps produce. Try these tubes sometime.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/altec.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Don also brought along some <a href="http://www.vintage-hifi.2itb.com/catalog_11.html">Altec 755a </a>drivers in these open back cabinets that were originally designed to be suspended on walls. The bass was missing and the treble was subdued, but what a midrange.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/altec%20modern.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Another pair of Altecs, but this time a couple of more modern examples that Tony bought for under $30. He said the tweeter was a piezo unit and it certainly sounded like it. We agreed that replacing it even by a good inexpensive dome would make a huge difference.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/ev1.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/ev3.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/ev2.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">David brought these old ElectroVoice 15" SP15B full range speakers in simple baffles. They apparently have a pretty high QTS and are meant for open baffles. They showed a reasonable amount of bass, but initially we were a bit underwhelmed by the midrange. Then we hooked up the SV811-10 amp and they started to strut their stuff. The following CD really worked well with these.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/toussant.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Another CD we used a lot was <a href="http://www.amazon.com/Genuine-Negro-Carolina-Chocolate-Drops/dp/B002U33GQU/ref=sr_1_1?ie=UTF8&qid=1287886357&sr=8-1">"Genuine Negro Jig"</a> by the Carolina Chocolate Drops. Tracks 6 and 7 were played quite often.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/811-10.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">The SV811-10 amp. I brought it to a meet a year ago but it was yet another of my many failures. This time it worked. Essentially it is a 12HG7 feeding an SV811-10 with Tubelab's Powerdrive in between. The SE output transformers are some Audio Notes that I bought 10 years ago and never really used. It's all very heavy and a bit of a monster, but it certainly was much more powerful than the 6V6 push pull amps and so we used it most of the afternoon to cope with the various speakers we tried. To me at home, the sound of the 12HG7s in this amp of the lightbulb amp dominates the 6V6 or SV811-10. The Audio Note transformers produce more fine detail than the cheap toroids as you would expect. Dollars talk. The 811 amp is just more dynamic which I suspect is due to the power supply.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/jordan.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">David's Jordans on top of the modern Altecs. The cabinets are from Parts Express and the tweeters are Aurum Cantus. I've heard them at a few meets now and they continue to impress. The bass is amazing from such small units and the midrange is really good.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/dac2.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Inside my DAC which is the one used in the <a href="http://www.lampizator.eu/LAMPIZATOR/LAMPUCERA/CD%20DAC%20Lampucera%20lampizator.html">Lampucera</a>. I've done some of the mods, replacing some of the caps and the output opamp with an LM4562. The replacement caps are very low esr PSA units from United Chemi-con that are avilable from<a href="http://www.mouser.com/ProductDetail/United-Chemi-Con-UCC/APSA100ELL271MHB5S/?qs=mCDvQ2dq6dUtII1ZKogNTA%3d%3d">Mouser</a> for 81 cents. I don't know if the caps recommended in the Lampucera article are better, but these certainly made a huge improvement over the stock caps. And yes, the case is from an old PC power supply.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/dac.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">David's <a href="http://www.lampizator.eu/LAMPIZATOR/REFERENCES/NOS-DAC_AD1865/ad1865.html">AD1865</a> version of the Lampucera. I didn't hear enough of it to say whether I preferred it to the smaller version. By the way, removing the SMD caps is a pain, but if I can do it, you can.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/lightspeed1.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/lightspeed2.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/lightspeed3.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Finally, David's Lightspeed attenuator. This thing is absolutely brutal in that it lays everything bare. We found that it worked very well with certain combinations but not everything. There is plenty of info on the web about the Lightspeed and I suspect I will be trying it out soon.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">So I was really pleased by this meet because I brought my 12B4A line stage along as well and all four of my items worked! Four out of four!</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-87376440288564860632012-02-08T08:52:00.001-08:002012-02-08T08:52:58.487-08:00November 2009<div id="General_Content" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">The meeting was held at Steve's place in Stirling, VA. Many thanks to Steve for hosting once again. The pattern was a bit different this time with there only being about six of us present until noon and not too much equipment. Fortunately, more people arrived in the afternoon with more stuff to listen to so it turned out fine.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">There was some discussion about the 6V6 competition and we have chosen the weekend of April 10 / 11 however we haven't picked the Saturday or Sunday yet. We played a CD of a compilation of some tracks we could possibly use in the 6V6 competition. Since none of us has a 6V6 amp built yet, we used John's 45 amp and Steve's Econowave speakers to determine which tracks worked and which didn't. Most tracks were fine but some such as <a href="http://www.amazon.com/Susan-Graham-Belle-%C3%89poque-Reynaldo/dp/B00000AG7M/ref=sr_1_2?ie=UTF8&s=music&qid=1258390036&sr=8-2">Susan Graham singing Reynaldo Hahn </a>needed more power than what the 45 could provide. I will update the 6V6 page with tracks that did ok. Steve is also thinking of substituting a more efficient woofer for the JBL LE14A.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">There was much interest in David's Art Arrays which really made a good impression with that wall of sound effect you get from line arrays. Since David only finished them a few days before, they needed to loosen up a little and I look forward to hearing them again. Since I believe John still has his Straight 8's, we might do a comparison at a future meet.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh1004%20018.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh1004%20019.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh1004%20020.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">They were finished in a black vinyl from PE. Apparently, the total cost for both speakers was approximately $300.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">For a while we were using Steve's 6SN7 linestage and David's chip amp. The chip amp really made the Art Arrays jump.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh1004%20021.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Steve brought out his Seas three ways and they always impress as being a very smooth speaker but the Art Arrays are more dynamic. One of the tracks we were listening to was the first from <a href="http://www.amazon.com/Rodrigo-y-Gabriela-Bonus-DVD/dp/B000HKDEE2/ref=sr_1_4?ie=UTF8&s=music&qid=1258391064&sr=8-4">Rodrigo y Gabriela </a>that starts off with a very loud wack and the Art Arrays really had the jump factor needed. By the end of the day however, it was so nice to sit back, relax and listen to the Seas speakers.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh1004%20024.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">An so on to Steve's Econowaves.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh1004%20025.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh1004%20029.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh1004%20030.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">First, Steve managed to get the cabinets off Ebay for $45 for the pair and he has certainly done a great job in getting them to look good. The sound of these speakers is quite different from the Art Arrays and for me the preference comes down to the music and instruments being played. Both are dynamic but the scale of the presentation is quite different with the arrays imaging better for me than the econowaves but the timbre of the econowaves suited some instruments better than the arrays and vice versa. It's a personal preference.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh1004%20026.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">As mentioned earlier, we used John's 45 amp to see what tracks worked and those that didn't. John mentioned that he had installed some Silk grid chokes but that the difference in sound quality was slight.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Below is John's Akido breadboard but the gain was too high for it to be used effectively. I had the same problem when I built one a while ago which leads me to think that most builders should try a low mu input tube with this design.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh1004%20027.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">John brought his Foreplay 3 along and this time it was working. He mentioned the excellent service he got from Bottlehead in dealing with the transformer problem. It really produced good sound particularly with the chip amp and later a digital amp that unfortunately I forgot to take a picture of..</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh1004%20028.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">I had hoped to have a picture of my SV811-10 amp but something got bumped on the way down and so it didn't work. There is always next time.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh1004%20023.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Some of the gang. As you can see, the discussions are sometimes more important than the music and that is a good thing. We had a number of new attendees and we are so pleased to have them come along.</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-67890632708463753722012-02-08T08:51:00.003-08:002012-02-08T08:51:21.412-08:00July 2009 meet<div id="General_Content" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">We held our meeting at Frank's place in lower Pennsylvania near Route 83. There were two listening areas, the first in Frank's recording studio and the other in a lounge area. The acoustics were quite different with the recording studio being dry as you would expect. There were about 10 of us there.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">One of Frank's friends builds speaker cabinets (as well as drums) and you can see some of his work here. We mere mortals can only gaze in rapped admiration.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bh0cabs.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Here is a front panel.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bhfront.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Two chip amps with acrylic tops</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bhgain.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">John working on his Foremost with a Foreplay 3. It looked there was a problem with the high voltage taps on the transformer. There is such a difference between these latest Bottlehead products and the Foreplay 1 that got me started.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bhfp3.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><div>Frank's soldering station area. It's fascinating to see the conditions where other's do their work. This looks like it would be a good area to work in because of all the natural light and of course it is well organized.</div></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bhdesk.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><div>The Accutron speakers and the Jordans on the floor. I only heard the Accutrons briefly and they seemed to have calmed down from the meet earlier in the year. Unfortunately I didn't hear the Jordans this time, I was in the other room.</div></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bhjordan.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><div>These are transmission lines with Alpair 3 inch speakers that Steve got for $20 each. The bass was impressive for such a small speaker but it looked like they had to work hard to produce decent volume. It would be interesting to hear them in an array.</div></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bhalpair.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">A Lightspeed chip amp in some old Sun computer boxes.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bhlsp.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><div>A Mesa Baron amp with 6 5881's per side. It could be configured as triode or pentode and with different levels of feedback. The amp sounded quite different in each configuration which could help with some music or hinder.</div></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bhbega.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">One of the best parts of the day was driving too and from the meet across northern Harford County in Maryland and lower Pensylvania. The county roads were relatively empty and the countryside was in the full lush green of summer with fields and fields of corn. Absolutely beautiful.<div> </div><div>Along the way home I came across this building which turned out to be a church. Yes, it's a crappy photo with too much road.</div></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/bhharford.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-56670498866620003262012-02-08T08:49:00.001-08:002012-02-08T08:49:42.605-08:00April 2009 Bottleneck meet<div id="General_Content" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">We held out meeting at Steve's place in Stirling, VA. Since only 6 people turned up, we were able to spread out and relax without having to swap around seating positions etc. Fortunately, we had plenty of gear to listen to. This first picture shows Steve's new bay window which really opened up the room. The box at the back is a Foreplay with a remote volume control. In front are Paramours if I remember correctly.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/picture%20001.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Next is a chip amp that we sampled later in the day.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/picture%20002.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Then follows my 5894 push pull amp with 5687 drivers (LM317 in the tail). The output transformers are Websters given to me some years back by John Hogan after he came to one of our meets. It takes 10 -15 minutes before these tubes are ready to stabilize and about 30 minutes before the amp starts to sound half decent. I will probably rebuild them with a higher voltage than the 300 I used just to get my feet wet with them. You can see through them because I use polycarbonate. The power supply is separate.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/picture%20003.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Next is another gain clone chip amp that we played later in the day. What a beautiful layout, just a bit more room than mark's teapot housing from a few years back.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/picture%20004.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">On to my <a href="http://db.audioasylum.com/cgi/m.mpl?forum=magnequest&n=2560&highlight=preamp+transconductance">John Swenson transconductance </a>line stage. The design uses a slightly modifed Gary Pimm CCS. Again, I use polycarbonate and incidently, I used <a href="http://www.amazinggoop.com/amazinggoop/index.html">GOOP</a> to glue the motor run caps and sundry other parts to the polycarbonate. The stuff works.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/transconductance.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Next is the DAC of the day, in this case the boards used in the <a href="http://www.lampizator.eu/LAMPIZATOR/LAMPUCERA/CD%20DAC%20Lampucera%20lampizator.html">Lampizator</a>. As I remember, David had replaced the caps with Oscons and the op amp with the recommended LM4562 ( I may have the wrong opamp) .We were all very impressed by this DAC and at under $100, even I will probably try one.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/picture%20006.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">We used this Foreplay 3 (stock) for quite a while and we will probably use it in the 6V6 competion next year.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/fp3.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">On to the speakers. First we have the Stomberg Carlsons in a corner cabinet. They don't have much bass but they are very pleasant listening and would be ideal in your beach shack. Next to them in the tall cabinet are the Tangband speakers we heard at the last meet. They didn't do as well this time and I can understand why Steve prefers his Seas speakers, at least in this room. In the bottom left is one of the Jordans.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/sc.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">On the right we have the <a href="http://www.frugal-horn.com/spawn-plans.html">Half Changs </a>with the cheap full range BUF Pioneer speaker and a cheap Dayton tweeter. These did very well with a surprising amount of bass, but the mid range was no where near as good as the little Jordans.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/half.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Next are the <a href="http://audiokarma.org/forums/showthread.php?p=1856214#post1856214">Econowaves</a> with a JBL LE14A for the bass and Selenium D220 driver. We currently plan to use these for the 6V6 competition.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/waveguide.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">The crossover for the Econowave.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/xoverw.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">An finally the crossovers for the Jordans / ribbon tweeters. Unfortunately, we didn't get to really hear them because one of the speakers was turned upside down and the mistake cause the bass to go to the tweeter. Poor ribbon.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/xovers.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-79110389419524767992012-02-08T08:47:00.003-08:002012-02-08T08:47:59.988-08:00October 2008 Bottleneck meet<div id="General_Content" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">We held our meeting at Fritz's place in Newark, Delaware.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Frank also took pictures that you can view <a href="http://www.craftyhands.net/bottlehead_meet_112008.htm">here</a>.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">We've held a number of meetings there and I always enjoy his listening room. Even better, he has a room off to the side where we can line up the speakers that are not in action at the moment.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/Bottleneck_2008_10%20001.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">We first listened to Doug's (PakProtector) TX coupled linestage, with 6S4P-EV triodes( CCS-ed LTP circuit ), balanced( and SE ) outputs along with his rebuilt Heathkit W6m push pull amps.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Here is the underside of the line stage.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/Bottleneck_2008_10%20004.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Below you can see Doug's amps driving Frank's Accuton based speakers which you can read more about <a href="http://www.craftyhands.net/cupasoup.htm">here</a>. The workmanship of Frank's speakers amazed us all.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/Bottleneck_2008_10%20002.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">We then listened to Steve's pair of 2 way towers with <a href="http://www.parts-express.com/pe/showdetl.cfm?Partnumber=264-852">Tangband 6.5"</a> and the Vifa D26 neo tweeters. I really liked these speakers and the TBs are supposedly 92db. They handled Flight of the Cosmic Hippo very well.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/Bottleneck_2008_10%20003.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">By the way, in the above photo hiding behind the towers you can see Fritz's Stromberg Carlson speakers which I believe are horn loaded. Fritz runs them with a Fostex tweeter and I would like to hear more of them at some stage.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">On to the first of Joel's amps, the EL34.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/Bottleneck_2008_10%20005.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Here is another photo where it is driving the Dayton BR1 speakers.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/Bottleneck_2008_10%20006.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">and a photo from above where you can see the motor run cap sticking out from the side. Now this is my style of building!!</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/Bottleneck_2008_10%20007.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">We also listened to his Akido linestage.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/Bottleneck_2008_10%20008.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Below we can see my 12B4A amp driving Steve's Seas based 3 way speakers. Doug is bringing his linestage into the picture while Fritz is messing with the Conrad Johnson CD player.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/Bottleneck_2008_10%20010.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Towards the end of the day we tried a Sony Playstation as the source. If you look closely you can see the remote control at the end of the cord.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> <img src="http://829b.com/images/Bottleneck_2008_10%20011.jpg" /></div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">Below on the right, you can see Joel's Spud amp and to the left of it, John's 45 amp housed in an Ikea box.</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-78581977290165456702012-02-08T08:46:00.001-08:002012-02-08T08:46:41.972-08:00February 2008 Bottleneck meet<div id="General_Content" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">The meet was held again at Castlesteve's house in Sterling, VA in February 2008. Here are some of the photos.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><div> </div><div><img src="http://829b.com/images/Hawthorn.JPG" /></div><div> </div><div>We've heard these <a href="http://hawthorneaudio.com/drivers.htm">Hawthorne speakers </a>a few times now and they are a very simple solution and there is a surprising amount of bass. I'm not sure which model they are but Joel has informed me that they are the Silver Iris. Steve has done further work on the baffles and having the speakers lower in the baffle closer to the floor has apparently worked well.</div><div> </div><div><img src="http://829b.com/images/3_way.JPG" /></div><div> </div><div>Above are the 3 way speakers. I can't remember what was in them and could somebody send me the details so that I can post them on the site. I didn't get a good listen to them because I was in the kitchen at the time.</div><div> </div><div>The amp at the bottom of the picture with the blue transformers is the 5965/6V6 pp amp my daughter built. I wanted her to learn how to saw, drill, solder, deal with wires etc. Because she inherited her mother's dexterity with her hands, she did a much better job than I ever did. It is the <a href="http://www.audiotropic.net/Products/machine.html">Poinz Music Machine </a>and uses metal 6V6's and the <a href="http://www.edcorusa.com/products/transformers/cxpp/cxpp25-8-7_6k.html">Edcor output transformers</a>. I've been very pleased with this amp and the word to describe it is 'pleasant'. No I have not tried it with glass 6V6s because I don't have any.</div><div> </div><div><img src="http://829b.com/images/KT88_Hud.JPG" /></div><div> </div><div>Above is Hud's KT88 single ended amp. He has a <a href="http://hudlyaudio.blogspot.com/2007/05/success-is-thick-and-juicy.html">web site </a>which describes it. We used this amp for quite a while and it seemed to handle every loudspeaker we demoed quite well.</div><div> </div><div> </div><div> <img src="http://829b.com/images/Pi_2.JPG" /></div><div> </div><div>Above are the <a href="http://www.pispeakers.com/contents.html">Pi 2</a> speakers which would be a great simple to build starter speaker.</div><div> </div><div><img src="http://829b.com/images/Metronome.JPG" /></div><div> </div><div>Above are the Metronome speakers with a small Fostex driver. They sounded better on the piece of board than on the carpet. These work very well as a full range speaker and I really liked them. They have the benefits of a full range single driver with a surprising amount of bass. Makes me want to try a <a href="http://www.zillaspeak.com/bib.asp">BIB</a> sometime which looks to be easier to construct. You can read more about the Metronome design principles <a href="http://web.mac.com/scress1958/iWeb/Steves_Tube_Trials/Metronome-Speaker.html">here</a>.</div><div> </div><div><img src="http://829b.com/images/IMG_2095.JPG" /></div><div> </div><div>To carry your Metronomes, you buy a Honda Element.</div><div> </div><div>Unfortunately, I forgot to take more photos, but Dave Chen also took some <a href="http://www.flickr.com/photos/superdavechen/sets/72157603847296835/">photos</a>.</div></div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-836411969057354995.post-41167069631622208222012-02-08T08:41:00.001-08:002012-02-08T08:41:23.633-08:00Bottlenecks - the story<div id="General_Content" style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">The MD/DE/PA/DC/VA Bottlenecks group has been meeting for a number of years. Initially we met in the libary in Elkton, MD but in recent years we have met in members houses. We usually have some <a href="http://www.audioasylum.com/forums/bottlehead/bbs.html">Bottlehead</a> equipment to audtion, but we also are very interested in encouraging attendees to bring their DIY creations, be they amplifiers or speakers. Tube equipment is particularly welcome.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">When we were holding our meets in the library, I had to reserve the room. For some reason or other, the lady who would make the appropriate entry in the reservation always referred to us as the Bottlenecks and the name stuck. Below is a photo of the library with the table loaded with goodies. The speakers were the Fostex BK16's.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/Dscf0114.jpg" /> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"> </div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;">The table of goodies.</div><div style="background-color: white; font-family: Arial, Geneva, sans-serif; font-size: 13px; text-align: left;"><img src="http://829b.com/images/Dscf0115.jpg" /></div>Unknownnoreply@blogger.com0