tag:blogger.com,1999:blog-38394018391011901572023-11-16T05:04:44.956-08:00Grid LeakThis is a history of some of the restoration and somtimes really crazy repair adventures I have had working on a many Vintage guitar and Hi-Fi amps, radios, old tube studio gear and all sorts of audio gear
Questions at; ElectricEther@yahoo.comShantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.comBlogger15125tag:blogger.com,1999:blog-3839401839101190157.post-34252615682216496852021-09-22T13:39:00.000-07:002021-09-22T13:55:07.704-07:00<p> One of My MOST RECENT July 2021 Blues amp projects is this amp I made from a Hammond Organ amp with two 6bq5 / EL84s and one of my special design preamps. The 6BQ5s in this test are used, two different ones, but give that "Vintage Drive" tone. Later tests with two new husky SOVETEK EL84 tubes showed a much bugger sound with more clean power <br /></p><p></p><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"><iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.blogger.com/video.g?token=AD6v5dxhP1XzRzKs3UzGcWopEgFgEziK1vHS9z8yU3hKz2VZceogUchnBMqIQh-K3EhXR8MxEmhY5JFNKVdPl8zfJQ' class='b-hbp-video b-uploaded' frameborder='0'></iframe></div><p></p><p>Have been modding, repairing, restoring guitar amps since 1965, when I was around the Sunset Strip in Hollywood CA, at the end of the <span><span>psychedelic</span></span> era. I was in the same clubs as Jimi Hendrix, <span class="ILfuVd NA6bn c3biWd"><span class="hgKElc">Jim Morrison and more.</span></span></p><p><span class="ILfuVd NA6bn c3biWd"><span class="hgKElc">I have done repair, custom mods, on many, many different amps through the years, Marshall mods, Harp amps, Rock amps, Guitar wiring mods etc.</span></span></p><p><span class="ILfuVd NA6bn c3biWd"><span class="hgKElc">Contact Troy at; Downey Music Center, 562-869-4485 in Downey CA<br /></span></span></p><p><br /></p>Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com0tag:blogger.com,1999:blog-3839401839101190157.post-82610715161916589122020-11-08T18:33:00.003-08:002020-11-08T18:33:45.709-08:00<p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBgWlB4MNfZxWdLokJ8hSvmphHN-XnyQ1idDPH31s7QQNmw7sUgFoNBthFRBg4Q33bDa-c0CwBSgLzyHPkVzUkbko-1ecn84sLusRjkCzjEIhC_ZVu6sigqE_ADEc57_7dzhx5DmDKGPM/s1120/RCA_console_b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="840" data-original-width="1120" height="440" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBgWlB4MNfZxWdLokJ8hSvmphHN-XnyQ1idDPH31s7QQNmw7sUgFoNBthFRBg4Q33bDa-c0CwBSgLzyHPkVzUkbko-1ecn84sLusRjkCzjEIhC_ZVu6sigqE_ADEc57_7dzhx5DmDKGPM/w586-h440/RCA_console_b.jpg" width="586" /> </a></div><div class="separator" style="clear: both; text-align: center;"> <div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYn7-0zhbL7PaM5gCkxVpjq7HiUdNOkqULFKmqb5_QiozyPVnQQlpJdHukGTaXVLsSHTc2ljjgCze8i0sB73IIEnsaLhJ0IXyw6HkdPqFYwZKmCmt4AgNhevfPYK9C1Q6_qPWlwQIOy5Q/s2048/Cinematic_console_Thunderbird_b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1536" data-original-width="2048" height="389" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYn7-0zhbL7PaM5gCkxVpjq7HiUdNOkqULFKmqb5_QiozyPVnQQlpJdHukGTaXVLsSHTc2ljjgCze8i0sB73IIEnsaLhJ0IXyw6HkdPqFYwZKmCmt4AgNhevfPYK9C1Q6_qPWlwQIOy5Q/w518-h389/Cinematic_console_Thunderbird_b.jpg" width="518" /></a></div><br /></div><div class="separator" style="clear: both; text-align: center;"><br /> </div><br /> This is a Radio Station Mixing Console made around 1945 - 47. It mixes three microphones, two pronograph turntables, (when a music record was played) and one line level signal. <p></p><p>The mix is sent to, either out on the air, or back to the studio, or listening audience</p><p>I managed to get all of it running fine again, NO CIRCUIT INFO, and it sounded warm and smooth.</p><p>It had dual power supplies, a lot of 6sc7 tubes and a internal monitor amp and speaker. <br /></p>Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com0tag:blogger.com,1999:blog-3839401839101190157.post-35819581393636944722020-11-08T16:36:00.002-08:002020-11-08T16:36:50.389-08:00<p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-GCPMxNakpxXKIDdDqR5OzPtj3t2VOUOkaDdQI-dEIGn0bJMVKKAkbsOIj44fglt-jwamD2P7D5b12gWrU2OSmY6in3MXHAEtp2HxR7XTbGkZiLseOzMrCYiUp1gBkKKFPhoHVZxOjk4/s1664/Rico_Marsh_Blues_breaker.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1248" data-original-width="1664" height="443" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-GCPMxNakpxXKIDdDqR5OzPtj3t2VOUOkaDdQI-dEIGn0bJMVKKAkbsOIj44fglt-jwamD2P7D5b12gWrU2OSmY6in3MXHAEtp2HxR7XTbGkZiLseOzMrCYiUp1gBkKKFPhoHVZxOjk4/w641-h443/Rico_Marsh_Blues_breaker.jpg" width="641" /></a></div><p></p><p>Another Summer 2020 amp Mod job for one of the Carlsbad, CA 'Moose Lodge Players' amps was this Marshall 18 Watt amp. I made it cathode bias for more compression and smooth Blues Tone, all carbon resistors, and changed over to 7199's for a real 24 watts out. <br /> </p>Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com0tag:blogger.com,1999:blog-3839401839101190157.post-79956285502990324012020-11-08T16:32:00.000-08:002020-11-08T16:32:06.917-08:00<p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGRW4msP3cCXV8taIsuICMblaS7ERVH2BIVp4JQOqTmsjyCwEzJg88te0gI3rHIuPywPZsX404UjTNbkvFJlNZIupXhRhQuFw77y1n2zGsly_JbLltG6rC6ZqMgJdOsc5nO_34ndodWGc/s1664/Rico+Tweed+Twin_b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1248" data-original-width="1664" height="408" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGRW4msP3cCXV8taIsuICMblaS7ERVH2BIVp4JQOqTmsjyCwEzJg88te0gI3rHIuPywPZsX404UjTNbkvFJlNZIupXhRhQuFw77y1n2zGsly_JbLltG6rC6ZqMgJdOsc5nO_34ndodWGc/w636-h408/Rico+Tweed+Twin_b.jpg" width="636" /></a></div><br /> A recent modding job for a great Oceanside, CA player, is a Tweed Twin amp with four EL34 tubes in cathode bias for much less power and much more compression. Also using carbon resistors in the audio paths, the plate and cathode resistors etc. for big tone and smooth compression. A 12at7 driver and vintage 12ax7 tubes for the preamp. This was done at the http://tubeamprepairshop.com/ really messy bench, from the huge amount of amps that have been here before. Summer 2020<br /><p></p>Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com0tag:blogger.com,1999:blog-3839401839101190157.post-30822084718010530902016-12-03T10:47:00.000-08:002016-12-03T10:47:38.617-08:00Yamaha PM1000 Transistor Mike Preamp wild Racking Projects<div style="text-align: center;">
Here are some 'interesting' Yam projects</div>
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This is four channel rack job for a Italian customer</div>
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Below shows my placing the out transformer in the back</div>
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of the module so each one had both in/out transformers inside </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiP00VwwaVxKF1sgedAt4qSrh2DLTiXI-GwL4MRkJxQcDdbF6E-LSX6gWiKqUqgpy_5lyBl_wopdyp48sJAM3VCpi1kZShV19Hv3mtUwNOGwFJL_hOi07nYOGKtzJ989w7_6HY_i7_iamk/s1600/melotti_Yam_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="245" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiP00VwwaVxKF1sgedAt4qSrh2DLTiXI-GwL4MRkJxQcDdbF6E-LSX6gWiKqUqgpy_5lyBl_wopdyp48sJAM3VCpi1kZShV19Hv3mtUwNOGwFJL_hOi07nYOGKtzJ989w7_6HY_i7_iamk/s320/melotti_Yam_a.jpg" width="320" /></a></div>
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They had to be mounted on a frame that was going into a wood box </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKoovnEucKW7r-byewGHHnH6QlpCr7YSLVFL6UGLPU8mp6og_guIgxYtSL39LTB9d6e6TF8K0ACV__nqsgJOKExiX5rgvV3FoCYht4gBgWhMl3vq-IY-3qhF0waizSvwhY8YrAuIEZhh4/s1600/melotti_Yam_b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="243" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKoovnEucKW7r-byewGHHnH6QlpCr7YSLVFL6UGLPU8mp6og_guIgxYtSL39LTB9d6e6TF8K0ACV__nqsgJOKExiX5rgvV3FoCYht4gBgWhMl3vq-IY-3qhF0waizSvwhY8YrAuIEZhh4/s320/melotti_Yam_b.jpg" width="320" /></a></div>
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Four XLR input jacks, and four TRS output jacks</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyDtp_oEcM-XxhkfiuKCRdAWUX8MlIpa48N3ymUw1NdrBTjcfidthZd2kkSt8hHu42WHmAhkpiVAWrT4bZ5VgIFsnhtn4G4_TTuYBctY14i5TzPDsvlKbEd-UY2z7uyXQKkQHhuk04KGA/s1600/melotti_Yam_d.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyDtp_oEcM-XxhkfiuKCRdAWUX8MlIpa48N3ymUw1NdrBTjcfidthZd2kkSt8hHu42WHmAhkpiVAWrT4bZ5VgIFsnhtn4G4_TTuYBctY14i5TzPDsvlKbEd-UY2z7uyXQKkQHhuk04KGA/s320/melotti_Yam_d.jpg" width="320" /></a></div>
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The 1/4" DI in jacks are at the bottom of the channels</div>
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You can see a black cable going to one jack </div>
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I added a passive EQ from a old tube stereo console</div>
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This allowed the owner to be able to patch it in to add some</div>
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Vintage 'Smooth' tone to any sound </div>
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Below shows measuring things out</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5aRGcGuq7_8bUqGtz_gynrm2RoxBVCTgV8nYa0CUtN5M3qQLuSQQp_-1wgzbjnlYgzSolnaVETppDS2u9sXfMZjV_chXJSP0s7EwYrgGt_fSO1K809uRczGXSsUkWP7PESEBJ6zntXps/s1600/Melo_yam_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5aRGcGuq7_8bUqGtz_gynrm2RoxBVCTgV8nYa0CUtN5M3qQLuSQQp_-1wgzbjnlYgzSolnaVETppDS2u9sXfMZjV_chXJSP0s7EwYrgGt_fSO1K809uRczGXSsUkWP7PESEBJ6zntXps/s320/Melo_yam_a.jpg" width="320" /></a></div>
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The below shows measuring and drilling out the Hammond</div>
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16" wide by 8" deep by 3-1/2" high box for two rack jobs at a time</div>
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This was one way to keep up with orders and make sure both were</div>
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drilled out and all parts placed in the same places.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjz9ASZwqPSlx2xom3Lqio4h4VuNQJMnFzUNzqe-H3Oj236ye147al95BE1IGgsnvnmuILTjFGEKKmN_nlel_U_lqDn_bA29j2eW1FQxZWRarbH_W5tPJtTNVgMky4u8Z0nTgbT-acdV9A/s1600/Drill_end_chas_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="279" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjz9ASZwqPSlx2xom3Lqio4h4VuNQJMnFzUNzqe-H3Oj236ye147al95BE1IGgsnvnmuILTjFGEKKmN_nlel_U_lqDn_bA29j2eW1FQxZWRarbH_W5tPJtTNVgMky4u8Z0nTgbT-acdV9A/s320/Drill_end_chas_a.jpg" width="320" /></a></div>
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I replaced the output transistors with lower gain bigger power</div>
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transistors and increased the idle to get more power, less noise and</div>
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a much bigger, tighter sound, and nice round tone Hi-Fi bass </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYPt5Q53xnL8wkg1o3WUwiHsEoovJBVkwglpBUjPXCoZE8rVf0ru910pO45Ix0H1WX5ptsfMyFXPHXN9l2KWYX3kDuvex6Sc6U4ULqaKU0-86SU_rvl540Grku8VnXVg-YbgFEKgIt_PM/s1600/New_trans_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="242" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYPt5Q53xnL8wkg1o3WUwiHsEoovJBVkwglpBUjPXCoZE8rVf0ru910pO45Ix0H1WX5ptsfMyFXPHXN9l2KWYX3kDuvex6Sc6U4ULqaKU0-86SU_rvl540Grku8VnXVg-YbgFEKgIt_PM/s320/New_trans_a.jpg" width="320" /></a></div>
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This unit used EDCOR 600 ohm line out transformers</div>
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These 'step-up' the signal three times more for up to +28DB levels</div>
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out, and the line stage runs at three times less gain for less noise </div>
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Any questions or interest in projects?</div>
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<div style="text-align: center;">
George at ElectricEther@yahoo.com</div>
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Vista, CA 92084</div>
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Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com0tag:blogger.com,1999:blog-3839401839101190157.post-2496679011959623062015-07-28T16:07:00.000-07:002016-12-03T03:50:49.599-08:00Microphone preamps transistor and vintage tube style<div class="separator" style="clear: both; text-align: center;">
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<span style="font-size: 12.0pt; line-height: 115%;">One
of over 30 stereo mike preamps I made for Tape-Op customers </span><br />
<span style="font-size: 12.0pt; line-height: 115%;"> Preamps
have Tamuri transformers, phantom, pad, and Di in jacks</span></div>
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<span style="font-size: 12.0pt; line-height: 115%;">60Db
gain max, over 22DB levels into 600 ohms</span></div>
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<br /></div>
<div class="separator" style="clear: both; text-align: center;">
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<span style="font-size: 12.0pt; line-height: 115%;">The PM1000
board is center, one gain stage per side, In and out transformers are back right
and left sides</span></div>
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<span style="font-size: 12.0pt; line-height: 115%;">There is a
diode coming from the DC in jack, (middle back), to prevent reverse polarity</span></div>
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<span style="font-size: 12.0pt; line-height: 115%;">I used
camera tape to “stick” all the wires down, as Cam tape not gooey</span></div>
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<br /></div>
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<span style="font-size: 12.0pt; line-height: 115%;">The level
control, (upper right front) a 600 ohm pot, is feeding the 600/600 ohm line out
transformer through a two watt, 10 ohm, carbon resistor. The slowness of the
carbon resistor adds some warmth. </span><br />
<br />
<span style="font-size: 12.0pt; line-height: 115%;">The gain stages have a push-pull output
stage, that can drive approx 22 volts into 67 ohms RMS, so the 300 ohm load not
a problem. The shiny TO-5 transistors are the new ECG NPN/PNP outputs. I used
good audio quality Xicon “Reds”, aluminum electroylitics in the signal path.
They were the best a few years ago, now the ELNA Silmic and Cerafine caps are
way above any of these for audio quality</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEWdglLi9DA14yxPD3jQ8nyXLMiecFic4J-7CY2jPIEgCGoKEnW8p1C3rSv8Kmimaoq2mcxpK6TZ2AXNcFCBGSO6aahHk0YByBXxV0CxRRw-ZPzgbTzayKpHOZ_4KUWIg5zs5h1YvuJ9E/s1600/Label_game_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEWdglLi9DA14yxPD3jQ8nyXLMiecFic4J-7CY2jPIEgCGoKEnW8p1C3rSv8Kmimaoq2mcxpK6TZ2AXNcFCBGSO6aahHk0YByBXxV0CxRRw-ZPzgbTzayKpHOZ_4KUWIg5zs5h1YvuJ9E/s400/Label_game_a.jpg" width="400" /></a></div>
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<span style="font-size: 12.0pt; line-height: 115%;">This is a old Altec transister PA amp being turned into a Mike Preamp and power supply for five other mike preamps. I had the engraved labels made to get a 'Pultec look' for the panel.</span></div>
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<div class="MsoNormal" style="text-align: left;">
<span style="font-size: 12.0pt; line-height: 115%;"> Here is the
new inside, the PM1000 board with two gain stages mounted to the front. </span><br />
<span style="font-size: 12.0pt; line-height: 115%;"> The
yellow inter-stage transformer is in the center front, the in transformer is at
upper left on the back of the front panel. This transformer adds 'smooth' to the sound and more gain without noise.</span><br />
<span style="font-size: 12.0pt; line-height: 115%;"> Power supply, feeding to the barrier strip, is upper
middle, on the back, and right. </span><br />
<span style="font-size: 12.0pt; line-height: 115%;"> The power supply in the Altec provided +44 for the preamps, and +48 for the phantom power</span></div>
<div class="MsoNormal">
<span style="font-size: 12.0pt; line-height: 115%;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjjIJOzXSFyW0xUKgUv_w9gY5Yyu4-OqOMHK_vip4zck9E23k7Z0CHzQXPgQYbll8cYiYVz8MWMVg-WTv14yjlV-ye_WhABt3Bv5DY_WTSUkHwwKffUt5GsTlJFANb0wWCfSheqhm_OFTM/s1600/Yam_channel_VU_test_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjjIJOzXSFyW0xUKgUv_w9gY5Yyu4-OqOMHK_vip4zck9E23k7Z0CHzQXPgQYbll8cYiYVz8MWMVg-WTv14yjlV-ye_WhABt3Bv5DY_WTSUkHwwKffUt5GsTlJFANb0wWCfSheqhm_OFTM/s320/Yam_channel_VU_test_a.jpg" width="320" /></a></div>
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuelBdkaUTP_CWTj2Gb6HH9YGAgLDKm37PJy9gsUoMIQdyKUrLpTQzuNjRsTJGHZOU2XB2-LNU7hFCwfH3w7sGOv6-vuTLKqURYQqjJ9OV3z3LrMyYtETm1mzXzFQbwdK7ilCUMe9SNCQ/s1600/Yam_channel_VU_test_b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuelBdkaUTP_CWTj2Gb6HH9YGAgLDKm37PJy9gsUoMIQdyKUrLpTQzuNjRsTJGHZOU2XB2-LNU7hFCwfH3w7sGOv6-vuTLKqURYQqjJ9OV3z3LrMyYtETm1mzXzFQbwdK7ilCUMe9SNCQ/s320/Yam_channel_VU_test_b.jpg" width="320" /></a></div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="MsoNormal" style="text-align: center;">
<br />
<span style="font-size: 12.0pt; line-height: 115%;"> Here you can see the VU at "O" VU which is set for "O" VU = +4 level out</span><br />
I test every preamp at +12DB levels out to see that the line out stage </div>
<div class="MsoNormal" style="text-align: center;">
has headroom over +12db into 600 ohms. </div>
<div class="MsoNormal" style="text-align: center;">
</div>
<div class="MsoNormal" style="text-align: center;">
Here are some pics of some basic steps to 'racking' two Yamaha PM1000 </div>
<div class="MsoNormal" style="text-align: center;">
or any mixing console 'channel strips'</div>
<div class="MsoNormal" style="text-align: center;">
</div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8Bfj-3wIA5OI2KITU8050okGiPeANR0Qjp2GCf2HNzU4xH2lMJRnp6zr7YKx8tS4WHw5ATDlSTEpnNsX6DaHmXS83yZT6XcZvNweeFGVeELAHWYv0pRk-aXugEHJm0nhIa72pkmxuWL0/s1600/Dual_design_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="187" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8Bfj-3wIA5OI2KITU8050okGiPeANR0Qjp2GCf2HNzU4xH2lMJRnp6zr7YKx8tS4WHw5ATDlSTEpnNsX6DaHmXS83yZT6XcZvNweeFGVeELAHWYv0pRk-aXugEHJm0nhIa72pkmxuWL0/s320/Dual_design_a.jpg" width="320" /></a></div>
<div style="text-align: center;">
Step one is getting everything lined up and where doe it go? questions answered</div>
<div style="text-align: center;">
Making sure the front and back panels are perfect most important</div>
<div style="text-align: center;">
If a hole is just a bit to far off on the front, it can not be fixed</div>
<div style="text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
</div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1bezBarQkoZeFnfll3kSbch5yM9m3mixxkpe5HCxEarMOHmbaFjFKlCbazeBEwew9ES7qaDqphtv65TooruD-gtXU_dB1xgEnBa9Pn-yKbw_97W4o75o__ONvDfUiSI5iu0DsdQXAKA8/s1600/hole_trick_b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1bezBarQkoZeFnfll3kSbch5yM9m3mixxkpe5HCxEarMOHmbaFjFKlCbazeBEwew9ES7qaDqphtv65TooruD-gtXU_dB1xgEnBa9Pn-yKbw_97W4o75o__ONvDfUiSI5iu0DsdQXAKA8/s320/hole_trick_b.jpg" width="320" /></a></div>
<br />
<br />
<div style="text-align: center;">
A trick way to mark the holes on the front side </div>
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjJQN9TVL9Xy9cyDOx3c87qIBoZF79_jJ_vqCgqvcCUF2d6xI1nlfSh6hvr9dKwdNjlfuUmx_Dnv4Um_RuTDBRfGdjy8YpF8OyW4wgMT-RF4FzqzMIbtmJ07NnioJE91LzwWFt-xcHY9fc/s1600/one_cut_yam_mod.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="193" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjJQN9TVL9Xy9cyDOx3c87qIBoZF79_jJ_vqCgqvcCUF2d6xI1nlfSh6hvr9dKwdNjlfuUmx_Dnv4Um_RuTDBRfGdjy8YpF8OyW4wgMT-RF4FzqzMIbtmJ07NnioJE91LzwWFt-xcHY9fc/s320/one_cut_yam_mod.jpg" width="320" /></a></div>
<br />
<br />
<div style="text-align: center;">
One channel ready to be mounted</div>
<div style="text-align: center;">
The one pot will be replaced with a EQ - In/Out switch </div>
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjauQK_Qz3zeTQDO2kp95kv6bDxKrInWU6DQmSEJAmbS1GOR68AE0s3n8WaA8yyWG6KLHypfcxu96h8bsQtRktUvUr1vNjaiIk4EDV90xXqnXMSdm5WNlWkwrLOYz99zGPW-T-erd8BkyI/s1600/punch_holes.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="222" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjauQK_Qz3zeTQDO2kp95kv6bDxKrInWU6DQmSEJAmbS1GOR68AE0s3n8WaA8yyWG6KLHypfcxu96h8bsQtRktUvUr1vNjaiIk4EDV90xXqnXMSdm5WNlWkwrLOYz99zGPW-T-erd8BkyI/s320/punch_holes.jpg" width="320" /></a></div>
<br />
<div style="text-align: center;">
Punching holes with a chassis punch once pilot holes are drilled </div>
<br />
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjaJ8eibLCBK7wLV9oDuhNZiE7wc30xUo2UC4rJaGbnaeQa0q5Mx3X39ZOfD8QcagAZhBP_88Yo23aE3WN-iDARqvApe9ZCJbxsLfxXa4LvvuDKSlPSOUkChAyQCeEmB9dtZtQFuH3CUMo/s1600/two_yam_mods_in_box.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjaJ8eibLCBK7wLV9oDuhNZiE7wc30xUo2UC4rJaGbnaeQa0q5Mx3X39ZOfD8QcagAZhBP_88Yo23aE3WN-iDARqvApe9ZCJbxsLfxXa4LvvuDKSlPSOUkChAyQCeEmB9dtZtQFuH3CUMo/s320/two_yam_mods_in_box.jpg" width="320" /></a></div>
<br />
<div style="text-align: center;">
Two channels mounted with fresh screws from the back </div>
<div style="text-align: center;">
Now that all the holes have been drilled or punched, all the parts can be mounted </div>
<div style="text-align: center;">
with no worries as to proper placement</div>
<br />
<div class="separator" style="clear: both; text-align: center;">
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<div class="separator" style="clear: both; text-align: center;">
I built a whole series of thee 19" by 3-1/2" rack mount</div>
<div class="separator" style="clear: both; text-align: center;">
chassis stereo preamps with the talkback yam boards. These boards</div>
<div class="separator" style="clear: both; text-align: center;">
have two 'Gain Stages' on each board, so you just need a input transformer</div>
<div class="separator" style="clear: both; text-align: center;">
gain, level, phantom power controls, DI input and a output transformer</div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhyleivrvEb6CXPTbAWe8EDJRDTnhPvZhCUwTQBdJFn0SSDbjwrOhPj86idlvDb0lbhiVX2pZ_hSK18Q0_wb1T4WNcQ5SNVhOjSYwlcCaCg5KgIwzSgWI4uQ8xBDBRzfCDwumUbPywkES4/s1600/StPreNewFrnt.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="188" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhyleivrvEb6CXPTbAWe8EDJRDTnhPvZhCUwTQBdJFn0SSDbjwrOhPj86idlvDb0lbhiVX2pZ_hSK18Q0_wb1T4WNcQ5SNVhOjSYwlcCaCg5KgIwzSgWI4uQ8xBDBRzfCDwumUbPywkES4/s320/StPreNewFrnt.jpg" width="320" /></a></div>
<br />
<div style="text-align: center;">
This is one of a series of 19" by 1-3/4" single - space rack mount stereo preamps</div>
<div style="text-align: center;">
I built with a new board I designed that has a Modded PM1000 'Gain Stage'.</div>
<div style="text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhiHKLpzrJnAKn_U1f8LTC7x0hKEtnUI87oBRJt6YOLdAqPOaO_zFhgOun4x5FV2pl1nqmjEQe78lOJ9wudRoyMJeuwIQQ49uQuDrhPOj_IEi6mtheHvQM3kSVWeo_C9r1JhFGHifK8yWY/s1600/Yam_new_mono_b.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="280" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhiHKLpzrJnAKn_U1f8LTC7x0hKEtnUI87oBRJt6YOLdAqPOaO_zFhgOun4x5FV2pl1nqmjEQe78lOJ9wudRoyMJeuwIQQ49uQuDrhPOj_IEi6mtheHvQM3kSVWeo_C9r1JhFGHifK8yWY/s320/Yam_new_mono_b.JPG" width="320" /></a></div>
<br />
<div style="text-align: center;">
This board has the basic setup with, Left to Right</div>
<div style="text-align: center;">
Mike balanced in, Pad-off, -12, -20db, DI-input, Level, Phantom power on/off</div>
<div style="text-align: center;">
Gain, and a sweet vintage SONY 600 ohm line out transformer</div>
<div style="text-align: center;">
</div>
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<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg2kKq0A3jyJMM-Hac53k1YAGrYl8WzsBea1ya6g6QfNNGWoKEQs1lvLf7fPxFGBhhTkJG2m98sD0e1Adiv8uBCRQ6OXTrM6Bb0FXzzRcgqmzb_5WUlQa35ASM0cQ-lpeT3HtrRqfwGKsg/s1600/Yam_new_mono_c.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="233" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg2kKq0A3jyJMM-Hac53k1YAGrYl8WzsBea1ya6g6QfNNGWoKEQs1lvLf7fPxFGBhhTkJG2m98sD0e1Adiv8uBCRQ6OXTrM6Bb0FXzzRcgqmzb_5WUlQa35ASM0cQ-lpeT3HtrRqfwGKsg/s320/Yam_new_mono_c.JPG" width="320" /></a></div>
<div style="text-align: center;">
</div>
<div style="text-align: center;">
The board has a +48 volt power supply filter, phantom power feed, </div>
<div style="text-align: center;">
Balanced input stage on the top left, phantom and pad on the lower right</div>
<div style="text-align: center;">
and the 'Line Gain Stage' on the lower left.</div>
<div style="text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhT-Fo_6dgQeUycAxenFdP5pNfYs7guVkTlI-OUQ03PDhaN84ygrgQdrA0x4hpKP3Ox7LGpk0dlc1rwe_WXKNwCfOUNFHwgng5NZqFe1nP2ehb8mi-Wq7CXeM1FgEudLRf1v88iOFbEzyg/s1600/Yam_new_mono_g.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhT-Fo_6dgQeUycAxenFdP5pNfYs7guVkTlI-OUQ03PDhaN84ygrgQdrA0x4hpKP3Ox7LGpk0dlc1rwe_WXKNwCfOUNFHwgng5NZqFe1nP2ehb8mi-Wq7CXeM1FgEudLRf1v88iOFbEzyg/s320/Yam_new_mono_g.JPG" width="320" /></a></div>
<div style="text-align: center;">
<br /></div>
<div style="text-align: center;">
The four transistor 'Gain Stage' has been modded by; </div>
<div style="text-align: center;">
a. changing the two output transistors to lower gain/higher power versions</div>
<div style="text-align: center;">
that increases the big warm tight sound, raises the maximum output level, </div>
<div style="text-align: center;">
and lowers the noise. b. using metal film resistors for lower noise, c. the board </div>
<div style="text-align: center;">
has pads for radial <span class="_Tgc"><b>electrolytic</b></span> caps or metallized <span class="st" data-hveid="45" data-ved="0ahUKEwjnovyC9dfQAhVpqlQKHfaDAugQ4EUILTAB">polyester</span> caps.</div>
<div style="text-align: center;">
The metallized <span class="st" data-hveid="45" data-ved="0ahUKEwjnovyC9dfQAhVpqlQKHfaDAugQ4EUILTAB">polyester</span> caps have a clearer, 'Tube Amp" sound </div>
<div style="text-align: center;">
</div>
<div style="text-align: center;">
<br /></div>
<div style="text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtPHfFW4tFMLXfNioIA6o3i1qBjtGBDDy1_VyyK_lI9ijhXQN-kROZoBgf1aR24feUp1BzI699096UtnQYn1CUqfVl92GIf8SmYvEvsntU9O_Ax_UUes3ZLWJlpZ8PPR_Uy4GUhtGJzmQ/s1600/Yam_new_mono_h.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtPHfFW4tFMLXfNioIA6o3i1qBjtGBDDy1_VyyK_lI9ijhXQN-kROZoBgf1aR24feUp1BzI699096UtnQYn1CUqfVl92GIf8SmYvEvsntU9O_Ax_UUes3ZLWJlpZ8PPR_Uy4GUhtGJzmQ/s320/Yam_new_mono_h.JPG" width="320" /></a></div>
<div style="text-align: center;">
<br /></div>
<div style="text-align: center;">
A board under test, the VU is set for "O" VU +4 level out</div>
<div style="text-align: center;">
This new board can drive down to 56 ohms and can drive a </div>
<div style="text-align: center;">
step-up line out transformer for +28DB out levels, and tons</div>
<div style="text-align: center;">
of NEVE sounding headroom. </div>
<div style="text-align: center;">
<br /></div>
<div style="text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhgsHkMQ2bMmeItG61NgvoF-Tgw-qz8fVrka98TqN0-zktHNfqkhYDqIZbrO9wWJZYEDgzROPtLRZU7h4AW7Q-TkdQxr8yKy2as2u1KNUNrm1OpeGumdR_f7Q2Dzk2rMsYRu7UkQtw6kbk/s1600/Yam_new_mono_J.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhgsHkMQ2bMmeItG61NgvoF-Tgw-qz8fVrka98TqN0-zktHNfqkhYDqIZbrO9wWJZYEDgzROPtLRZU7h4AW7Q-TkdQxr8yKy2as2u1KNUNrm1OpeGumdR_f7Q2Dzk2rMsYRu7UkQtw6kbk/s320/Yam_new_mono_J.JPG" width="320" /></a></div>
<div style="text-align: center;">
The two round 'metal - can' transistors are NTE great big and warm<br />
sounding transistors. They are idling at almost one-half watt each.<br />
This gives the 'Gain Stage' a big tight bass and a strong clean sound.<br />
The 'Gain Stage' is also noiseless.<br />
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWvJet2Sr6TxNP4Gs42ScVIhzeuZCCmr2Y72uZIBikNeTV4FzvbkLJ_UvKxSbbs8KbcUoxF8SEy9TpMa-9kDt6DJ0NYBHOusSEv1QNHGw-ZP3OZZjOcQPpkht8eup3fnCT_olvrrxmYT0/s1600/Yam_new_mono_d.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWvJet2Sr6TxNP4Gs42ScVIhzeuZCCmr2Y72uZIBikNeTV4FzvbkLJ_UvKxSbbs8KbcUoxF8SEy9TpMa-9kDt6DJ0NYBHOusSEv1QNHGw-ZP3OZZjOcQPpkht8eup3fnCT_olvrrxmYT0/s320/Yam_new_mono_d.JPG" width="320" /></a></div>
<br />
This is the true - balanced in stage that is super quiet<br />
It has a unbalanced out to the level control, or line in<br />
selector switch, and about 20DB gain. <br />
<br />
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIzUoCMlD4Nx-1YPd8SbD24EYpXZXjSHLMHqcIMTYD42j_6Pf-kGzq4DxhaVaZu-jaXIC5BUarslD7lfTlcPXYk9KU0t6qWzSXhyphenhyphenf-5i2mz2cZAlwgIiGWlUQWM8qlJz8zwmB8Bp0sxw0/s1600/Yam_new_mono_i.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="283" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIzUoCMlD4Nx-1YPd8SbD24EYpXZXjSHLMHqcIMTYD42j_6Pf-kGzq4DxhaVaZu-jaXIC5BUarslD7lfTlcPXYk9KU0t6qWzSXhyphenhyphenf-5i2mz2cZAlwgIiGWlUQWM8qlJz8zwmB8Bp0sxw0/s320/Yam_new_mono_i.JPG" width="320" /></a></div>
</div>
<div style="text-align: center;">
The phantom power, two stage pad, and click filter is shown</div>
<div style="text-align: center;">
here on the lower left corner. The balanced mike in goes through</div>
<div style="text-align: center;">
the pad/phantom circuit, and then to a mike in transformer, or the </div>
<div style="text-align: center;">
transformerless balanced in preamp</div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div style="text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjINzCkaYO14DHlkdxCz0AMn2GxyGhiYrbWXHen-8aT7mdLDySSMJKWZP22MjjsEwYLffW1ZnV3eqwCNe6LsowB9lG9XzCzqWjAHiF2T0BhTihJbcC9_CSCY125UffpUK2fh8UBam8BTCM/s1600/StPreNewLin.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="204" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjINzCkaYO14DHlkdxCz0AMn2GxyGhiYrbWXHen-8aT7mdLDySSMJKWZP22MjjsEwYLffW1ZnV3eqwCNe6LsowB9lG9XzCzqWjAHiF2T0BhTihJbcC9_CSCY125UffpUK2fh8UBam8BTCM/s320/StPreNewLin.jpg" width="320" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiySWUUCYUcNBUOeU3WgrghJHXliX_97hVltWen-YOdFyERKoU6bn6y1H4NC3Sr9Earwp9olyDCkptSG0hNL8mPV9iHq9xeaYJypVg8ZtxSM6cObMWPmEeUsIER8237YxQ2JDu6_dagOCc/s1600/StPreNewBck.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="185" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiySWUUCYUcNBUOeU3WgrghJHXliX_97hVltWen-YOdFyERKoU6bn6y1H4NC3Sr9Earwp9olyDCkptSG0hNL8mPV9iHq9xeaYJypVg8ZtxSM6cObMWPmEeUsIER8237YxQ2JDu6_dagOCc/s320/StPreNewBck.jpg" width="320" /></a></div>
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<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFZpXzbSzh9zbUXBN9aKPhroPsQ5fn-ugBUI-8nmXyNEE-ZALO6UT8eZrb6Mikdlzz-lv5En_ZfBi8BD3Fedp2hseSCsIttw4soyvMqoMvXWt6FfTF-of6T_VlmtbGOmJcD0RBJuFKiyo/s1600/St_pre_Frnt_cent_lr.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="205" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFZpXzbSzh9zbUXBN9aKPhroPsQ5fn-ugBUI-8nmXyNEE-ZALO6UT8eZrb6Mikdlzz-lv5En_ZfBi8BD3Fedp2hseSCsIttw4soyvMqoMvXWt6FfTF-of6T_VlmtbGOmJcD0RBJuFKiyo/s320/St_pre_Frnt_cent_lr.jpg" width="320" /></a></div>
<br />
<div style="text-align: center;">
This stereo preamp has a switch, Pr/Mix on the lower right, </div>
<div style="text-align: center;">
that selects the mike/Di inputs, or two RCA jacks on the back that</div>
<div style="text-align: center;">
allow you to hear your mix on your headphones. </div>
<div style="text-align: center;">
The 'Gain Stages' make great headphone amps for higher </div>
<div style="text-align: center;">
impedance headphones</div>
<br />
<div style="text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQLEisOpezpHKsR2sBYaNwMbMVtAop-XU8FpV53zhXryTOYX4jIkNr31iq8R59_lK3-gwLYdaEW60Zsh4nEHQuj19yK-kTnrIcM5LTeBf0Foh35q48VqD8qogkWPxTuGC3VxdksrfL8Ck/s1600/St_pre_frnt_lt_lr.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="205" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQLEisOpezpHKsR2sBYaNwMbMVtAop-XU8FpV53zhXryTOYX4jIkNr31iq8R59_lK3-gwLYdaEW60Zsh4nEHQuj19yK-kTnrIcM5LTeBf0Foh35q48VqD8qogkWPxTuGC3VxdksrfL8Ck/s320/St_pre_frnt_lt_lr.jpg" width="320" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8fG_Xc8KR9qcX2hgpAGs1ZlM_wkDr5XmtoHYsIN0GtZNnxsaFQmNqMQBi3vEApDwjflNvasgNLMeLcCu8ZYY3HDYBbNmLmtrfXAImeTO7-l1dniVqcyd7DN3-kTHW6qWQsI5MSEKlWsM/s1600/St_pre_Frnt_rt.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="175" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8fG_Xc8KR9qcX2hgpAGs1ZlM_wkDr5XmtoHYsIN0GtZNnxsaFQmNqMQBi3vEApDwjflNvasgNLMeLcCu8ZYY3HDYBbNmLmtrfXAImeTO7-l1dniVqcyd7DN3-kTHW6qWQsI5MSEKlWsM/s320/St_pre_Frnt_rt.jpg" width="320" /></a></div>
<div class="separator" style="clear: both; text-align: center;">
</div>
<div style="text-align: center;">
There is a +4 red LED for each channel</div>
<div style="text-align: center;">
<br /></div>
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<div class="MsoNormal" style="text-align: center;">
The preamp below is one of a series of "Classic 3-stage tube mike preamps</div>
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I built using all vintage parts including vintage tubes. <br />
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<br />
<div style="text-align: center;">
This classic circuit is given more headroom by using two #76 triodes </div>
<div style="text-align: center;">
in parallel to drive the 15k/600 ohm Altec 'Red' line out transformer </div>
<div style="text-align: center;">
This gave these preamps a comfortable +15DB out without clipping</div>
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<br /></div>
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<span style="font-size: 12.0pt; line-height: 115%;">One
of a pair of custom tube mike preamps built for a customer</span></div>
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<span style="font-size: 12.0pt; line-height: 115%;">Unit
has Vintage or NOS preamp tubes, wide range gain control</span></div>
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<span style="font-size: 12.0pt; line-height: 115%;">Russian
paper-oil caps, all vintage parts including the knobs</span></div>
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<br />
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<span style="font-size: 12.0pt; line-height: 115%;">These preamps (above/below)
have a vintage 39/44 tube or a rare EF40 tube</span><br />
<span style="font-size: 12.0pt; line-height: 115%;"> which is equal to a EF86, as the pre
stage</span><br />
<span style="font-size: 12.0pt; line-height: 115%;"> You can switch tubes without clicks while the preamp is
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<span style="font-size: 12.0pt;">One 6sn7 as a Class-A driver is coupled to
a large Philips line out transformer </span><br />
<span style="font-size: 12.0pt;">on the right side of the chassis. The gray box is the </span><span style="font-size: 12.0pt;">line out transformer</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0in;">
<span style="font-size: 12.0pt;">The big 1930's 39/44 tube is by the Altec 'green' input transformer on the left</span></div>
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<span style="font-family: "calibri" , "sans-serif"; font-size: 12.0pt; line-height: 115%;">This
preamp has all paper-oil caps, and three gain controls that give a </span><br />
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Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com0tag:blogger.com,1999:blog-3839401839101190157.post-78526754559944343592011-07-16T20:40:00.000-07:002011-07-16T20:42:48.158-07:00ClassicTone transformer on a 1968 Marshall Amp<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgdla12ubZC4Vuh9vsvOR_r38UQPYmXCQQhSITtap_BRZn7zZi-W8q_Tk1y6YtGqfL8ZieYhpwW8BaMvwnaA-VRlLhLMSO73k0gBguYB0C2UotDwn0meh3eNHzeF4yd6NMMVhDFG2Jst9c/s1600/Marsh_classic_tone_f_lr.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgdla12ubZC4Vuh9vsvOR_r38UQPYmXCQQhSITtap_BRZn7zZi-W8q_Tk1y6YtGqfL8ZieYhpwW8BaMvwnaA-VRlLhLMSO73k0gBguYB0C2UotDwn0meh3eNHzeF4yd6NMMVhDFG2Jst9c/s320/Marsh_classic_tone_f_lr.jpg" width="320" /></a></div><div class="separator" style="clear: both; text-align: center;"><span class="Apple-style-span" style="color: #0000ee; text-decoration: underline;"><br />
</span></div><br />
<div class="separator" style="clear: both; text-align: center;"><span class="Apple-style-span" style="color: #0000ee;"></span></div><div class="separator" style="clear: both; text-align: center;"><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-size: large;">This is a Marshall Super Tremelo Lead 100 watt head from 1968 </span></span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #0c343d;"><br />
</span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #0c343d;">I have repaired, modded or re-stored about 200? or so Marshall amps, starting back around 1971, which means I am older than I'll ever tell, but I will say, I started far enough back to work on, or try on not get killed by all those "nice" 200 Marshalls, SoundCitys, 300 watt Plush, and Orange amps.</span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #0c343d;"><br />
</span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #0c343d;">I had a 200 watt Marshall on the bench, around 1971, and the customer/friend was standing next to me. </span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #0c343d;"><br />
</span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #0c343d;">As the big ones did, this amp shorted out around the 6550s, and both of us freaked, and then somehow, we were both like five feet away, without even noticing it! </span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #0c343d;"><br />
</span></div><div class="separator" style="clear: both; text-align: center;"><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-size: small;"><span class="Apple-style-span" style="text-decoration: underline;"><span class="Apple-style-span" style="font-style: italic;">I think the HV fuse blew, and the amp sat there laughing at us</span></span></span></span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #0c343d;"><br />
</span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #0c343d;">This amp looked okay except for a bad 2nd bias cap. Here I am using a low-voltage power </span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #0c343d;">supply to charge up the caps and measure leakage current to see if they are good</span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #0c343d;"><br />
</span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #0c343d;">The one hooked up in the pic is for the mystery Tremolo oscillator tube cathode bypass</span></div><div class="separator" style="clear: both; text-align: left;"><span class="Apple-style-span" style="color: #783f04;"><br />
</span></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEhWpOhYLbtF1dFBWGnjx5cbUQtntBJpkpNBALedBmtnJr2ZghhprE9e-YQeiSEVGnRJVEuH-y3bPv-Pjco8DrqYd_9pCWmnGn9Pa4yxbTPZbcZCkPzbrWDB4z7yic_IqTqsQeOGAxhR0/s1600/Marsh_classic_tone_g_lr.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEhWpOhYLbtF1dFBWGnjx5cbUQtntBJpkpNBALedBmtnJr2ZghhprE9e-YQeiSEVGnRJVEuH-y3bPv-Pjco8DrqYd_9pCWmnGn9Pa4yxbTPZbcZCkPzbrWDB4z7yic_IqTqsQeOGAxhR0/s320/Marsh_classic_tone_g_lr.jpg" width="320" /></a></div><div class="separator" style="clear: both; text-align: center;"><span class="Apple-style-span" style="text-decoration: underline;"><br />
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<div style="text-align: left;"><span class="Apple-style-span" style="color: #0c343d;">When I had checked the bias supply, and all seemed good, I tried to bring the amp up slow on the variac and instantly got a odd hum out of the test speaker. I knew the only way this could happen in a tube amp is when the high voltage primary winding is shorting or leaking to the secondary. </span></div><div style="text-align: left;"><span class="Apple-style-span" style="color: #0c343d;"><br />
</span></div><div style="text-align: left;"><span class="Apple-style-span" style="color: #0c343d;">I checked to see if DC was on the speaker out by pulling the speaker off, and hooking up my Simpson VOM. Voltage instantly came up across the speaker out, as this amp has a diode rectifier. </span></div><div style="text-align: left;"><span class="Apple-style-span" style="color: #0c343d;"><br />
</span></div><div style="text-align: left;"><span class="Apple-style-span" style="color: #0c343d;">I then measured primary to secondary and there was a low ohms reading. The customer told me the amp never had any real power, and two techs had just checked it. </span></div><div style="text-align: left;"><span class="Apple-style-span" style="color: #0c343d;"><br />
</span></div><div style="text-align: left;"><span class="Apple-style-span" style="color: #0c343d;">The two "techs"? never bothered to actually unsolder one end of each bias cap to see if they were any good, or check the idle. I found the second cap was leaking bad, and the first was starting to go also.</span></div><div style="text-align: left;"><span class="Apple-style-span" style="color: #0c343d;"><br />
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</span></div><div style="text-align: left;"><span class="Apple-style-span" style="color: #0c343d;">Then, with low neg bias, the high idle current "smoked" the primary winding till it shorted across to the secondary, and then the "Hum"in the speaker.</span></div><div style="text-align: left;"><span class="Apple-style-span" style="color: #783f04;"><br />
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</span></div><div style="text-align: left;"><div style="text-align: left;"><span class="Apple-style-span" style="color: #0c343d;">I knew the <span class="Apple-style-span" style="font-weight: bold;">Classic Tone transformers were really great sound</span>, so I emailed them and was told they were just coming out with the new <span class="Apple-style-span" style="font-weight: bold;">2.2k primary for 100 watt amps</span>. This is a EL34 amp so I decided on the sweeter transformer as the amp has enough "grain" from the preamp. The transformer goes on fine, having to drill just two holes towards the choke for those mounting brackets. </span></div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">I "bias" El34s and 6L6gcs at 18 watts, and 6550s at 20 to 22 watts. I use the measure </span></span></div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">the voltage drop across the transformer primary method. </span></span></div><div><span class="Apple-style-span" style="color: #0c343d;"><br />
</span></div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">Some important tasks on old British amps</span> </span></div><div><span class="Apple-style-span" style="color: #0c343d;"><br />
</span></div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">A. I make absolute sure the negative bias supply is solid and </span></span></div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">steady, before going any further, as you do not want to blow a original part</span></span></div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;"><br />
</span></span></div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">B. I "goop", a black rubber sealant, Permatex, from Kragens, that does not </span></span></div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">conduct, drys fast, and peels off easy, unlike silicon, over all the high voltage </span></span></div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">connections. The plate and screen pins, all HV power supply connections, standby </span></span></div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">switch, AC switch, and fuses. This makes the amp "quieter" and more stable, or less </span></span></div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">likely to blow up, and there is nothing to touch that will spark one of your pinkys! </span></span></div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;"><br />
</span></span></div><div><span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">C. I clean-up everything, so that there is nothing that would short out, or leak high voltage to ground or other places not good for that to happen. I clean around the tube socket pins so the HV will not leak to the grid, and make sure all wires run decently and connections are solid and clean.</span></span></div><div><span class="Apple-style-span" style="color: #660000;"><br />
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</span></span></div><div style="text-align: center;"><span class="Apple-style-span" style="color: #660000;"><span class="Apple-style-span" style="font-size: large;"> <span class="Apple-style-span" style="text-decoration: underline;">This amp sounds super warm</span></span></span></div><span class="Apple-style-span" style="color: #660000;"><br />
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<span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">I listened to the local smooth jazz station for a while and it sounded great, very Hi-Fi! </span></span><br />
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<span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">This is a rare occurrence with a guitar amp</span>, as most are way to bright and hot to actually listen to music with and to enjoy the smooth tone. The amp also comes up very easy, unlike the low-impedance transformers as there is some "cushion" for the output tube plates.</span><br />
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<span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="font-weight: bold;">Super quality part, and super great service from ClassicTone company</span><span class="Apple-style-span" style="color: #660000;"><span class="Apple-style-span" style="font-weight: bold;"><span class="Apple-style-span" style="-webkit-text-decorations-in-effect: underline; text-decoration: underline;"><span class="Apple-style-span" style="font-size: 24px;"></span></span></span></span></span><br />
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<span class="Apple-style-span" style="color: #0c343d;"><span class="Apple-style-span" style="color: #660000;"><span class="Apple-style-span" style="font-weight: bold;"><span class="Apple-style-span" style="-webkit-text-decorations-in-effect: underline; text-decoration: underline;"><span class="Apple-style-span" style="font-size: 24px;">Recommend ClassicTone Highly!</span></span></span><span class="Apple-style-span" style="font-size: 24px;"> </span></span></span><br />
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</span></div>Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com0tag:blogger.com,1999:blog-3839401839101190157.post-35165606464290103272011-02-22T21:39:00.000-08:002012-06-06T00:03:29.648-07:00Giant Amps, Part One, the Stage Star<span class="Apple-style-span" style="font-size: large;"><span class="Apple-style-span" style="color: #274e13;">Sometimes you get giants</span></span><br />
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I have collector friends that find very odd and interesting things. This is a Valco "Stage Star" at 27" wide, by 20" high, and 11" deep. I could barely get it on the bench, my tired out old drafting table.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgApfT2x_23M0vddXlcfoRTTwB6wmyegHp4fBjUxR6LNJPbbErs8Q_1dhH-1cao_X_6UQNCwtwV6hW4X6t-5C0yZ1g4yOItXdAW4m1j3G3bghdcqaLmFkdNx8nclRMDpsrQGRDyMj_6Flo/s1600/Stage_Star_frnt_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="265" j6="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgApfT2x_23M0vddXlcfoRTTwB6wmyegHp4fBjUxR6LNJPbbErs8Q_1dhH-1cao_X_6UQNCwtwV6hW4X6t-5C0yZ1g4yOItXdAW4m1j3G3bghdcqaLmFkdNx8nclRMDpsrQGRDyMj_6Flo/s320/Stage_Star_frnt_a.jpg" width="320" /></a></div>
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It uses four 6" by 9" oval speakers, like older car speakers. You or your dad had one in the back of that 57 Chevy you were trying to score in years ago. These are "oval" speakers, popular in the 1950's as they were used in cars, because they fit into the dash or the back deck easier, due to their small width.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjov3anfhjYqhvK1g70_pcVp0A5KhRglmQsoXqMPZYQB77c3D5v1lAZrCnk-7D2qcCM4HTnpF0k7bUEnj671auK02pH9ftkFGe4XAnU-YwMITldMtHknnFSQY8MoSl4uVYTvkSNwDQVGfg/s1600/Stage_Star_preamp.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="266" j6="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjov3anfhjYqhvK1g70_pcVp0A5KhRglmQsoXqMPZYQB77c3D5v1lAZrCnk-7D2qcCM4HTnpF0k7bUEnj671auK02pH9ftkFGe4XAnU-YwMITldMtHknnFSQY8MoSl4uVYTvkSNwDQVGfg/s320/Stage_Star_preamp.jpg" width="320" /></a></div>
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Here you can see the preamp chassis taking a peek outside. Using a 6SJ7 pentode for the high-gain in, and 1/2 of a 6SC7 dual triode for the rest, Valco was able to create a very adjustable preamp. Their preamps had different sounding inputs, Accordian, Guitar, Treble for a bright sound, and low for more of a bass sound.<br />
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The easy way to work on some of these big monsters is to just have it all in front of you. This amp has the output transformer mounted on the baffle board, and a solid cable between the amp and preamp, so it is easier just to take either out by itself, and work on it there<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzZjaHJqmwqtn46X_93I-loghd7nZRX3OcsWH70dxLy_88zpCQiOiNq84hqZ0nEcm5n49kbwObW3LcYP25C5VK_8brWBbqW8KJ95pQH_6cE-T1bmWvjx_UUygvLC66899DGqgHEMdorog/s1600/Stage_Star_Pre_in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="140" j6="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzZjaHJqmwqtn46X_93I-loghd7nZRX3OcsWH70dxLy_88zpCQiOiNq84hqZ0nEcm5n49kbwObW3LcYP25C5VK_8brWBbqW8KJ95pQH_6cE-T1bmWvjx_UUygvLC66899DGqgHEMdorog/s320/Stage_Star_Pre_in.jpg" width="320" /></a></div>
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This amp is used strickly for Harp, as the amp and speakers give a nice compression and no harsh highs, good bass. Here is some of the typical simple, but mysterious wiring of a Valco preamp of the late 1950's, that gave a nice Hi-Fi sound, great for Blues or Country<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicEgCkj0kGYrCoARL2tkVAPgJoZi_PVJGSdI4Tob2f_dBB6ehlMxRCV21WxfilmHzzZ4wiEJ6AtWKkNK9t6_gQh9j7C2mnATsjWiTckXD2VXG6j3GHan5zbYgcU3YxZBUpWmKMrIrvZvU/s1600/Stage_Star_amp.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" j6="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicEgCkj0kGYrCoARL2tkVAPgJoZi_PVJGSdI4Tob2f_dBB6ehlMxRCV21WxfilmHzzZ4wiEJ6AtWKkNK9t6_gQh9j7C2mnATsjWiTckXD2VXG6j3GHan5zbYgcU3YxZBUpWmKMrIrvZvU/s320/Stage_Star_amp.jpg" width="320" /></a></div>
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The amp chassis is super simple, a 6sc7 driver, and two 5881 output tubes for a good 25 watts cathode biased, Class-A power amp, that drives the four speaks pretty fine. The 6sc7 is a metal tube, a early 6sl7 that was popular from the late 1930's to the 1950's. So this amp is still using some 1940's design motifs<br />
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What you can't see in the pics is the output transformer, which is mounted on the baffle board, so the amp can't go very far from the case unless you want to unsolder the transformer from the speakers and unscrew it from the board. Valco made small power amp chassis so they would fit between the speakers, as making even these big amps as small as possible was the way back then.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtPYuR-11Zjz5zhcyVSdsPSiE312iEGo2RNbntNczmsXDhkXjGu6w3yZHaEZew08YDgQN4gNRee_OaioaVfOwu4LTs1BrFZo3lUisypdFYH74dyogxgsfZnTAsw0kbYfTxR9851mUCnkw/s1600/Stage_Star_cvr.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="280" j6="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtPYuR-11Zjz5zhcyVSdsPSiE312iEGo2RNbntNczmsXDhkXjGu6w3yZHaEZew08YDgQN4gNRee_OaioaVfOwu4LTs1BrFZo3lUisypdFYH74dyogxgsfZnTAsw0kbYfTxR9851mUCnkw/s320/Stage_Star_cvr.jpg" width="320" /></a></div>
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Here is the monster with it's natty cover, with the "Stage Star" initials on the left top corner. This was a custom amp made by Valco, a builder, for some small company, probably a short run as a lot of unusual designs were not big sellers. It was not until Fender, Shure, Marshall and others turned the newer music stores into big business that a large quanity of amps were sold. Also, small companies existed on the East coast or the in the midwest that sold gear that was never seen in California, land of surf music and Fender amps, and then later these unique inventions faded away<br />
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</div>Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com0tag:blogger.com,1999:blog-3839401839101190157.post-33562452720378205012011-02-04T23:22:00.000-08:002012-06-06T00:12:48.734-07:00The Gibson Amp attack from 1947<span style="font-family: Arial, Helvetica, sans-serif;"><span class="Apple-style-span" style="color: #660000;"><span class="Apple-style-span" style="font-size: large;">Three Gibby amps at once </span></span></span><br />
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<span style="font-family: Arial, Helvetica, sans-serif;">Here is one of three Gibson BR-1 amps from the same owner, who loves the sound </span><span style="font-family: Arial, Helvetica, sans-serif;">of </span><span style="font-family: Arial, Helvetica, sans-serif;">this model for his style of blues playing, so he got two more for spares. </span><br />
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<span style="font-family: Arial, Helvetica, sans-serif;">Rebuilding all </span><span style="font-family: Arial, Helvetica, sans-serif;">three as they all had bad caps and damage from shipping and previous fools playing </span><span style="font-family: Arial, Helvetica, sans-serif;">around turned into a real adventure</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqd4rQHqPO3DKoKRC2pdBt4TiMosx66j3ZL-_CqU_nCHYvfA_BsrGFfLa61einM3SSYEf2Wjs58QSx5nSXS28QN0CywKQRXPyYjqMABwCM-feysqdqzz99_4Ce-PAp3POZMgH_1m5xUbM/s1600/Gibby_d.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: Arial, Helvetica, sans-serif;"><img border="0" h5="true" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqd4rQHqPO3DKoKRC2pdBt4TiMosx66j3ZL-_CqU_nCHYvfA_BsrGFfLa61einM3SSYEf2Wjs58QSx5nSXS28QN0CywKQRXPyYjqMABwCM-feysqdqzz99_4Ce-PAp3POZMgH_1m5xUbM/s320/Gibby_d.jpg" width="291" /></span></a></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">This is the first one, above, with a new custom cabinet, amp finished. </span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">The caps are all </span><span style="font-family: Arial, Helvetica, sans-serif;">underneath the turret board so I had to used several tools to cut the leads and fish them </span><span style="font-family: Arial, Helvetica, sans-serif;">out. There were 22 dead caps per amp as the 60 years is a bit too long, although the sellers on </span><span style="font-family: Arial, Helvetica, sans-serif;">ebay sold these pretty high</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXnJuwTOGVBWWN0jbKHkCL30BCtjKOcBaQG88CxtvSDfX-LzjRPEVD_1cwH7eDgCxwZ-1iNTq8QxFqGbsqXiQpvpEzBYGSGdKNOdaeq6jfM8zkp9AtyNFodUj7O1QXQSiEFHAdN3PumhU/s1600/Gibby_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: Arial, Helvetica, sans-serif;"><img border="0" h5="true" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXnJuwTOGVBWWN0jbKHkCL30BCtjKOcBaQG88CxtvSDfX-LzjRPEVD_1cwH7eDgCxwZ-1iNTq8QxFqGbsqXiQpvpEzBYGSGdKNOdaeq6jfM8zkp9AtyNFodUj7O1QXQSiEFHAdN3PumhU/s320/Gibby_a.jpg" width="259" /></span></a></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">This is a very early amp, about 1947, and it has 25 watts, lots of wires, two "metal" tubes, a small glass tube, three big glass ones, and a very heavy field-coil speaker. </span><br />
<span style="font-family: Arial, Helvetica, sans-serif;">One of the amps came packed very badly, with the wood magnet brace missing, and the speaker pulled the entire baffle board off.</span><span style="font-family: Arial, Helvetica, sans-serif;"><br /></span><br />
<span style="font-family: Arial, Helvetica, sans-serif;">This amp has a 6sj7 early pentode preamp tube, very close in specs to a EF86, and one of the best preamp tubes, a 6sc7, used for EQ and line input , a very good sounding tube, and a 6sn7 driver. Two veteran 6L6G tubes in push pull provide 25 watts to the massive 12" speaker</span><br />
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<span style="font-family: Arial, Helvetica, sans-serif;">The 6j7, the 6sj7, earlier 39/44 pentodes were great tubes and I have used them in Vintage mike preamps I have built, finding the 39/44 to be one of the quietest preamp tubes ever.</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVUpiwHmuWPLnR06jBtiSho85MsPSxwawiAbnZj0Ogi51gNwHiorS5OwznB9r7kwQht_bBSmcUitPval3oUHpYp17E9Fp31FhMNfsKcmsrRElD-hl4Qi56A50c_mkamdU-mwUgh6iyKhY/s1600/BR-1_two_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: Arial, Helvetica, sans-serif;"><img border="0" h5="true" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVUpiwHmuWPLnR06jBtiSho85MsPSxwawiAbnZj0Ogi51gNwHiorS5OwznB9r7kwQht_bBSmcUitPval3oUHpYp17E9Fp31FhMNfsKcmsrRElD-hl4Qi56A50c_mkamdU-mwUgh6iyKhY/s320/BR-1_two_a.jpg" width="274" /></span></a></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">Here is amp two, with the baffle repaired and now held with brass screws through the front, and a with a "notch" cut into the top so the 5u4 would clear because the previous owner could not figure out how to get the chassis out without hitting cabinet with the the tall glass 5u4 and 6L6 "G" "Coke Bottle" shape tubes!</span><br />
<span style="font-family: Arial, Helvetica, sans-serif;">This is a good sounding amp, but typical of early amps, a cabinet disaster.</span><br />
<span style="font-family: Arial, Helvetica, sans-serif;">This is number three, with a original aluminum baffle screen. </span><br />
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<span style="font-family: Arial, Helvetica, sans-serif;">Amp number three, I thought would be a pretty easy job as I knew the amp by now and knew what to do, I </span><span style="font-family: Arial, Helvetica, sans-serif;">thought, until I discovered the previous had "Re-wired" the controls and more in a vague </span><span style="font-family: Arial, Helvetica, sans-serif;">attempt to make some kind of new amp. </span><br />
<span style="font-family: Arial, Helvetica, sans-serif;">I was a lot of work figuring it out and lots of solder work </span><span style="font-family: Arial, Helvetica, sans-serif;">to get all these early heavy wires all with the same brown color back where they were!</span><br />
<span style="font-family: Arial, Helvetica, sans-serif;">These three amps were restored over four months, the last one in October.</span><br />
<span style="font-family: Arial, Helvetica, sans-serif;">Two brothers made amps for Gibson back then and made some really wild amps, one that had six output tubes and almost 50 watts of power</span><br />
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<span class="Apple-style-span" style="font-family: Arial;"><span class="Apple-style-span" style="color: #666666;">This link will take you to videos on youtube that show early Gibson amp</span></span><br />
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<span class="Apple-style-span" style="font-size: small;"><span class="Apple-style-span" style="color: blue;">http://youtu.be/YuJpfNzrOkI</span></span><br />
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<span class="Apple-style-span" style="color: #666666;">Info from www.ehow.com</span><br />
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<span class="Apple-style-span" style="color: blue;">http://www.ehow.com/about_5437499_history-vintage-gibson-amplifiers.html</span>Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com0tag:blogger.com,1999:blog-3839401839101190157.post-78091604812782296662011-02-04T23:11:00.000-08:002012-06-06T00:25:37.263-07:00The Strange Jukebox Amps from Seeburg<strong><span class="Apple-style-span" style="font-size: large;"><span class="Apple-style-span" style="color: #0c343d; font-family: Arial, Helvetica, sans-serif;">I have to be "Jack of all Amps" or get a normal job!</span></span></strong><br />
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<span style="font-family: Arial, Helvetica, sans-serif;"><span class="Apple-style-span" style="font-weight: bold;">I have worked on really big old Jukebox amps long ago,</span> and thought I would never see </span><br />
<span style="font-family: Arial, Helvetica, sans-serif;">one again, but I have a new friend that has about thirty of them and knows other </span><br />
<span style="font-family: Arial, Helvetica, sans-serif;">collectors, so I am in big juke-amp trouble now</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjm3jUKmgULZyBU53x6dWa0tnVxnn-OAMcsjyTlWM8twe4y_DVQFubkLcyPeJppNWH9BXxutkfI5V-oAea5Kghnk3cJWxyvJDalR7Lhy_mMV2BvuX8ZaeWTSdNb96k78gIJ-XDyL8qJMqo/s1600/Seeb_stereo_c.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: Arial, Helvetica, sans-serif;"><img border="0" h5="true" height="164" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjm3jUKmgULZyBU53x6dWa0tnVxnn-OAMcsjyTlWM8twe4y_DVQFubkLcyPeJppNWH9BXxutkfI5V-oAea5Kghnk3cJWxyvJDalR7Lhy_mMV2BvuX8ZaeWTSdNb96k78gIJ-XDyL8qJMqo/s320/Seeb_stereo_c.jpg" width="320" /></span></a></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">This is a Seeburg stereo tube jukebox amp. The whole thang is on the back door and <br />to service the amp, you just swing the door out and there it is.</span><br />
<span style="font-family: Arial, Helvetica, sans-serif;">This amp runs 6973 output tubes, which are like a Hi-Fi version of a 6bq5. The amp also has a "AVC" or automatic volume control circuit that keeps one record from being louder <br />than another record, or one song from being louder than another.</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhe5kY6LBAj6iGjZTuUKlhgdTaJ8pswqY3IdOcBOU_iKbsjwPFo3vA-4072N4Vl2mpCmZF8G88flvSnFNSrjMU630-LTdSH2W4NZUzGd3OBIWIbdvS43lfRrw45Lb8v0NFUACaMMeB4fp0/s1600/Seeb_stereo_d.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: Arial, Helvetica, sans-serif;"><img border="0" h5="true" height="171" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhe5kY6LBAj6iGjZTuUKlhgdTaJ8pswqY3IdOcBOU_iKbsjwPFo3vA-4072N4Vl2mpCmZF8G88flvSnFNSrjMU630-LTdSH2W4NZUzGd3OBIWIbdvS43lfRrw45Lb8v0NFUACaMMeB4fp0/s320/Seeb_stereo_d.jpg" width="320" /></span></a></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">More of this interesting pasta mess of wiring to figure out. There is a high-voltage <br />supply, a bias and DC turntabe motor supply, two 18 watt power amps, two preamps, <br />two tone control amps, a and a stereo AVC circuit all in there somewhere</span><br />
<span style="font-family: Arial, Helvetica, sans-serif;">The 6.3 volts AC for the filament comes from another transformer that is in the "Coin <br />Reciever" unit, so I had to sneak the filament volts off another amp! </span><br />
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<span style="font-family: Arial, Helvetica, sans-serif;">The way one of these amps works is this. The whole amp is dead, customer walks up <br />and puts coins in, the filament volts is turned on and the amp warms up. <br />Then when the arm starts moving to the first selection, the 115 volts AC to the high voltage transformer is turned on and the 5u4 cranks up the high voltage to the tubes just in time before the needle hits the record. These tricks save the tubes and amp as it in idle, just warm mode until needed, so the jukebox can sit ready all day long.</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhfZWrP71T3JHVrapF4sWPdnBCWK39E2mBkozSFPxhwZwQWLJWq-q-1YGcP2juLlgqfmW4wzCynUwIOMQSqCJ3q6Hy92v_2x7UCFslof1fiVD7fFFXp6wE4-8AO0SuwimPzOOAM81nNpCo/s1600/Seeb_stereo_b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: Arial, Helvetica, sans-serif;"><img border="0" h5="true" height="176" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhfZWrP71T3JHVrapF4sWPdnBCWK39E2mBkozSFPxhwZwQWLJWq-q-1YGcP2juLlgqfmW4wzCynUwIOMQSqCJ3q6Hy92v_2x7UCFslof1fiVD7fFFXp6wE4-8AO0SuwimPzOOAM81nNpCo/s320/Seeb_stereo_b.jpg" width="320" /></span></a></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">This is the "Testing method" a stereo turntable and a record of oldies. </span><br />
<span style="font-family: Arial, Helvetica, sans-serif;">I had two of these amps to get running, so we listend to the same oldies while I set the bias on the 6973 tubes, which was a adventure as one tube out of the four was at maxium hot idle and one of the four was at the low idle point. without balancing adjustments, tubes have to be matched for same idle, which means out of ten tubes, <br />maybe four would really match up</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWpVaJPaa4ZrLO5C8kzWiiF1wdnawUpJ0IlUMWHzvLOpwiiXteSV-JIdlmdEa6aYPCLmAHVVALYjjqdyskS2ovt0R7QqPL_XkGaKU50x67fWH_xZt_ndBRPzQ8COGgmQf5zRT8221zLrA/s1600/Seeb_stereo_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: Arial, Helvetica, sans-serif;"><img border="0" h5="true" height="193" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWpVaJPaa4ZrLO5C8kzWiiF1wdnawUpJ0IlUMWHzvLOpwiiXteSV-JIdlmdEa6aYPCLmAHVVALYjjqdyskS2ovt0R7QqPL_XkGaKU50x67fWH_xZt_ndBRPzQ8COGgmQf5zRT8221zLrA/s320/Seeb_stereo_a.jpg" width="320" /></span></a></div>
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<span style="font-family: Arial, Helvetica, sans-serif;">This kind of job is the "Yeah Sure i can do it", then you just have to pile through and use your wits to make it all happen, so the customer can get a good sounding amp back, <br />and you can get paid, then pay the rent, and go on to another month, more work.</span>Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com4tag:blogger.com,1999:blog-3839401839101190157.post-42847857724720622342011-02-04T22:43:00.000-08:002011-05-25T23:08:24.201-07:00The Wah Pedal, Caps and Coils, and Germanium Transistors<div class="separator" style="clear: both; text-align: center;"><br />
</div><span class="Apple-style-span" style="font-size: large;"><span class="Apple-style-span" style="color: #20124d;">The Wild Wahs</span></span><br />
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<span style="font-family: inherit;">I have a friend that is really into gear, and he was after a sooper Wah pedal for his setup</span><br />
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</span><span style="font-family: inherit;">After re-building several, I started using Vintage germanium transistors and just going </span><br />
<span style="font-family: inherit;">hog wild with the circuit, until I came up with a "Sooper-Wah" that has a very clear, no </span><br />
<span style="font-family: inherit;">grainy sound, lots of tone, and very warm strong "Wah". </span><br />
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<span style="font-family: inherit;">Also the volume level when the </span><span style="font-family: inherit;">wah is kicked in is actually a bit higher and the wah is quieter with the mods and "Germ" </span><span style="font-family: inherit;">transistors for a real "Hi-Fi warm rich wah sound</span><br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8fCErULYOIYbv_6Fi9yY3zLgF3QR9w05GK7Ik2v_EUZeqgyn-l-lGj2yekOLXPd48UrgURzw6RUEf__yxVwV7gSANYDXGjdSVCKiHCUgHXTWJD0Uk-QYb-xx5FZxTBMGf9a36dhHJckg/s1600/Super_wah_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" h5="true" height="186" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8fCErULYOIYbv_6Fi9yY3zLgF3QR9w05GK7Ik2v_EUZeqgyn-l-lGj2yekOLXPd48UrgURzw6RUEf__yxVwV7gSANYDXGjdSVCKiHCUgHXTWJD0Uk-QYb-xx5FZxTBMGf9a36dhHJckg/s320/Super_wah_a.jpg" width="320" /></span></a></div><span style="font-family: inherit;"><br />
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<span style="font-family: inherit;">This version above has three tone ranges and a bright switch, which gives six tone ranges, </span><br />
<span style="font-family: inherit;">and runs on 12 to 15 volts from a Wall Wart supply which gives more a more big full tone sound from the voltage starved </span><span style="font-family: inherit;">transistors, and a clear, rich "Wah"</span><br />
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<span style="font-family: inherit;">The low 9 volts is not enough for the transistors to generate all the hidden tones </span><span style="font-family: inherit;">and power in the sound, and 9 volt batteries are an ancient idea that was bad from the beginning, and still bad today, when re-chargable batteries are easy to use.</span><br />
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<span style="font-family: inherit;">Transistors are the key to really changing the sound of a lot of these vintage circuits, </span><br />
<span style="font-family: inherit;">and it takes research and testing to learn what transisors really give that special sound.</span><br />
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<span style="font-family: inherit;">I have had a lot of fun trying various germanium transistors to see what there sound qualities are and learning about the circuits and what they can do sonically</span><br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzRMpmn3lOprnXqbzCveUKeQxLNH0CpAwJOvFWMwCJNTblSQCAA3zsZ5SfRt5EahGgb_smrN2iWwkcoV5GtnY_9t6n1mK2n7EI0yIrLJzxGx1MYotrjNcrytCpcQ1qtNOP9KWQ1qkNyjI/s1600/Super_wah_b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" h5="true" height="220" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzRMpmn3lOprnXqbzCveUKeQxLNH0CpAwJOvFWMwCJNTblSQCAA3zsZ5SfRt5EahGgb_smrN2iWwkcoV5GtnY_9t6n1mK2n7EI0yIrLJzxGx1MYotrjNcrytCpcQ1qtNOP9KWQ1qkNyjI/s320/Super_wah_b.jpg" width="320" /></span></a></div><span style="font-family: inherit;"><br />
</span><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikYQvyEgSxrvrGf0JW0INnE79yMRpQpadL221FCWgNQVXCTzOFouvnY_TOhlZ_gXUTa7c9MH0hfTaN3HvuSrLOmtLQUaT6EdUBKHzTWCbkEclIkAhTm2wVTYVZ1tJsQeGKEjXB22DDfwM/s1600/Super_wah_d.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" h5="true" height="222" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikYQvyEgSxrvrGf0JW0INnE79yMRpQpadL221FCWgNQVXCTzOFouvnY_TOhlZ_gXUTa7c9MH0hfTaN3HvuSrLOmtLQUaT6EdUBKHzTWCbkEclIkAhTm2wVTYVZ1tJsQeGKEjXB22DDfwM/s320/Super_wah_d.jpg" width="320" /></span></a></div><span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">Modded wah pedals are right around $125 for complete mod, just email me for info on custom work</span>Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com0tag:blogger.com,1999:blog-3839401839101190157.post-49394510279118826452011-02-04T22:32:00.000-08:002011-05-25T23:10:20.625-07:00Class-A Williamson Vintage Hi-Fi amps<div style="text-align: center;"><span style="font-family: inherit;"><span class="Apple-style-span" style="color: #274e13;"><span class="Apple-style-span" style="font-size: large;">I finished</span></span></span><span class="Apple-style-span" style="color: #274e13;"><span class="Apple-style-span" style="font-size: large;"> a repair of a Knight KB85 stereo amp, and found it to be a great warm amp, </span></span></div><div style="text-align: center;"><span class="Apple-style-span" style="color: #274e13;"><span class="Apple-style-span" style="font-size: large;">very magical sound, typical of the great 1950s era of Hi-Fi</span></span></div><div style="text-align: center;"><br />
</div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDdfRM7zv0b_CFWkigqq0eTPw0QssEVQjtJxGWxcwz8Erkt1mQELxoq6jAKTcTAKModdYqWUyN_aDXAXW5L9MDnaPHOGe-B4kpxk2Ravtq4Kvrs0opTmivacy7TMDEZA_0UCSM72-FNhY/s1600/KB85_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" h5="true" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDdfRM7zv0b_CFWkigqq0eTPw0QssEVQjtJxGWxcwz8Erkt1mQELxoq6jAKTcTAKModdYqWUyN_aDXAXW5L9MDnaPHOGe-B4kpxk2Ravtq4Kvrs0opTmivacy7TMDEZA_0UCSM72-FNhY/s320/KB85_a.jpg" width="320" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNYfuJcPWsK60ALVkFoyzkjBiu_0bp1WVhF0G7JJIRufb4Jf70rbP0z1FTaEG3D3t-OR6gehhAjy9w6v7Q82u8UpetAvbiFFg_Qd7yJ4c_LPPISfpQT-6-G_yAlmUTmKvjXORb20JDrzI/s1600/Knight_final_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" h5="true" height="226" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNYfuJcPWsK60ALVkFoyzkjBiu_0bp1WVhF0G7JJIRufb4Jf70rbP0z1FTaEG3D3t-OR6gehhAjy9w6v7Q82u8UpetAvbiFFg_Qd7yJ4c_LPPISfpQT-6-G_yAlmUTmKvjXORb20JDrzI/s320/Knight_final_a.jpg" width="320" /></a></div><br />
These older Hi-Fi amps have fantastic output transformers and circuits designed to put <br />
out a wide range of frequencies, flat response, and small amounts of phase shift. <br />
<br />
I am surprised when I crank one of these amps up and hear really deep bass notes come <br />
out of the Wharfdale as most guitar amps have no real bottom end and are tuned <br />
toward highs out mostly as guitars need lots of high boost.<br />
<br />
<br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhX0tlGdm6x8pFkN-0rGgQzXC3bVV_ybwCMQOuuSCAkDDyZKSQArIuqZGWnGxk4Tttk0raQs2icVxzgO6uWYCLklxw6FV1dRn79Qiql1Acg0eGdusQGojSEl81OqwkYQM5DFZm0Rv0dtzA/s1600/Knight_me.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" h5="true" height="277" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhX0tlGdm6x8pFkN-0rGgQzXC3bVV_ybwCMQOuuSCAkDDyZKSQArIuqZGWnGxk4Tttk0raQs2icVxzgO6uWYCLklxw6FV1dRn79Qiql1Acg0eGdusQGojSEl81OqwkYQM5DFZm0Rv0dtzA/s320/Knight_me.jpg" width="320" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLWxaBFpncnLxrTblfUnuH4rYhmMSLuiCIfmpICGUB8q7fLZWQ9j-MEXB3ucEG1v-FNLH-15j7FRkVhoR_WHsxlAUeblTe2QXbyI602LHQ_bIuavzcSbrWpyag7YeWX8r4_vW5LsszId8/s1600/Knight_final_e.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" h5="true" height="210" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLWxaBFpncnLxrTblfUnuH4rYhmMSLuiCIfmpICGUB8q7fLZWQ9j-MEXB3ucEG1v-FNLH-15j7FRkVhoR_WHsxlAUeblTe2QXbyI602LHQ_bIuavzcSbrWpyag7YeWX8r4_vW5LsszId8/s320/Knight_final_e.jpg" width="320" /></a></div><br />
Here is some of the fun wiring underneath, and me measuring everything without <br />
melting one of my test leads while around the 485 to 500 volts on the plates of the KT66 <br />
tubes. I tested the amp with 6l6gc and these amps will run with EL34 tubes, but vintage KT66s <br />
are super smooth and very rich magical sweet sound.<br />
<br />
These tubes were invented by the English as a high voltage version of the 6l6g for their <br />
super-williamson circuis that became the Heath W-5M amps and others we know <br />
today.<br />
<br />
So the KT tubes are High-voltage versions of 6bq5, 6ca7, and 6l6 tubes and EL tubes are <br />
European versions of American tubes for serious High-Fi gear.Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com0tag:blogger.com,1999:blog-3839401839101190157.post-49780410887354440782011-02-04T22:15:00.000-08:002011-05-25T23:12:19.707-07:00Really OLD amps of all sorts<div style="text-align: center;"><span class="Apple-style-span" style="font-size: large;"><span class="Apple-style-span" style="color: #7f6000;">Here is a 1930's Wurlitzer Jukebox amp, one of my early </span></span></div><div style="text-align: center;"><span class="Apple-style-span" style="font-size: large;"><span class="Apple-style-span" style="color: #7f6000;">vintage restoration jobs </span></span></div><div style="text-align: center;"><span style="font-family: inherit;"><br />
</span></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgq-CbUPfdb1Uo4YeP-DJLt5NcH_9uzbYsYVc0_epZxn64ymY1KR9N_DEJSMubXxlKuhtnFxtYk2INjX8bGSPftr_UCdsgYezv_nkUPBcu8HJ_iNHYo-MmDHl1ISAh-u-84KcP9VBw6bDI/s1600/Big_seeb_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" h5="true" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgq-CbUPfdb1Uo4YeP-DJLt5NcH_9uzbYsYVc0_epZxn64ymY1KR9N_DEJSMubXxlKuhtnFxtYk2INjX8bGSPftr_UCdsgYezv_nkUPBcu8HJ_iNHYo-MmDHl1ISAh-u-84KcP9VBw6bDI/s320/Big_seeb_a.jpg" width="320" /></span></a></div><span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">This is more like the kind of gear I work on, a very old tube amp that might work after </span><br />
<span style="font-family: inherit;">spending hours of hopeful work shaping all the vintage parts back into some possible </span><br />
<span style="font-family: inherit;">working shape, and hopefully all will stay together and keep running, at least for a while</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEimvUtQY-OWk8dw02StuEqzrVFv_IFp_BmBq1cqE8zi1BITXLk3MJcWIaGfbgx5MvAV9T7_knbkoWAofYqo5y5epSV34h-zt8BlPiG9TKeAnj3vJTyKJLM6jVAy-6sbclMDdUlWKtZiNQY/s1600/Big_seeb_c.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" h5="true" height="193" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEimvUtQY-OWk8dw02StuEqzrVFv_IFp_BmBq1cqE8zi1BITXLk3MJcWIaGfbgx5MvAV9T7_knbkoWAofYqo5y5epSV34h-zt8BlPiG9TKeAnj3vJTyKJLM6jVAy-6sbclMDdUlWKtZiNQY/s320/Big_seeb_c.jpg" width="320" /></span></a></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: inherit;"><br />
</span></div><span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">Here you can see the wild, running all over the place wiring job, and now all the wire colors have </span><br />
<span style="font-family: inherit;">faded so they are all brown!</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">This amp really surprised me when I brought it up on the Variac, quiet, great smooth </span><br />
<span style="font-family: inherit;">tone, and very well behaved amp. The speaker sounded great also, with solid bass and </span><br />
<span style="font-family: inherit;">very good highs.</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">This amp like other all triode amps of this era, uses triodes with no cathodes. Then very clever wiring of the filaments seperates the tubes so each has it's own "cathode" grounding and biasing.</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">This amp uses two #30 triodes as preamp stages, a $45 driver, and two #45 output tubes, very much a "SE" amp. </span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">This amp also devolops negative bias for the two #45 triodes in the power stage by </span><br />
<span style="font-family: inherit;">placing the feild coil of the speaker in series with the center tap of the high-voltage coil.</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">So this amp has all the same circuit functions of a modern SE amp, three triode tube </span><br />
<span style="font-family: inherit;">driver stage and driver transformer, and push-pull triode output stage with fixed bias, way before diodes of any kind. One circuit has a #45 backwards as a bias rectifier, very clever for 1933!</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgt4M3rWIj6S6l8IdzvzajQ6vEG5QIe_pyqb0Y2i1BtPsRf1A8DPYCBu6RwMSQVbWPVGjxCNrMLBU-2LnjyM6_Ox76mwvCQyEOaipqmHz0wXAY_pE8QTKnuRlKaJPB9-qv2SDwLYSoDjcg/s1600/Big_seeb_b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" h5="true" height="249" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgt4M3rWIj6S6l8IdzvzajQ6vEG5QIe_pyqb0Y2i1BtPsRf1A8DPYCBu6RwMSQVbWPVGjxCNrMLBU-2LnjyM6_Ox76mwvCQyEOaipqmHz0wXAY_pE8QTKnuRlKaJPB9-qv2SDwLYSoDjcg/s320/Big_seeb_b.jpg" width="320" /></span></a></div><span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">The amp comes up very fast also as they selected #30 tubes for the preamp, and the </span><br />
<span style="font-family: inherit;">#45 driver and the 5Z3 rectifier tube come up fast also. </span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">Jukebox amps have to come up fast as the time between the customer putting in the quarters and the record playing can be very short, and the amp has to be ready before the needle hits!</span>Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com1tag:blogger.com,1999:blog-3839401839101190157.post-40643504350053409692010-12-24T18:13:00.000-08:002011-05-25T23:12:47.918-07:00From parts to Tweed Deluxe in four days October 2010<div style="text-align: center;"><span style="font-family: inherit; font-size: large;"><span class="Apple-style-span" style="color: #20124d;">This is a Tweed Deluxe 5E3 chassis I built in four days</span></span></div><div style="text-align: center;"><span style="font-family: inherit;"><br />
</span></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2qcFGFKSMosc2NAmDIjy4tl2Ofg9yEu2XsM9m9mu_cmSmhjtC-04px26pQxFFoRHmb7ONfKkdRP59j0cUQ9wYsPXTNRDrp94xqIGR3CWOqLrMmcv8N7Fagr6KY1KT3yZPIw4yfFifNlY/s1600/New_dee_l.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" height="240" n4="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2qcFGFKSMosc2NAmDIjy4tl2Ofg9yEu2XsM9m9mu_cmSmhjtC-04px26pQxFFoRHmb7ONfKkdRP59j0cUQ9wYsPXTNRDrp94xqIGR3CWOqLrMmcv8N7Fagr6KY1KT3yZPIw4yfFifNlY/s320/New_dee_l.jpg" width="320" /></span></a></div><span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">I built this amp for a friend that I have built Tweed era amps for. It takes time to get parts from the various mail-order companies to build these amps, and this time I had just one week to get the amp together for the customer, a situation I have had many times when building custom gear</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBExiq6GunJfNJ_13LRal9QTlswTW_9lG_l-96pB_ISEbJBj2Sepa9Lp-ErvQPjekgd3k-tof72YbdDXsBArZMZGL-m6ykYhjIeZ1gzcuUfVcwssmVHlx1RuTEVMjstYCVvMWweujlq2c/s1600/New_dee_k.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" height="240" n4="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBExiq6GunJfNJ_13LRal9QTlswTW_9lG_l-96pB_ISEbJBj2Sepa9Lp-ErvQPjekgd3k-tof72YbdDXsBArZMZGL-m6ykYhjIeZ1gzcuUfVcwssmVHlx1RuTEVMjstYCVvMWweujlq2c/s320/New_dee_k.jpg" width="320" /></span></a></div><span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">I built the amp with vintage Good-All coupling caps after testing them for one day with 300 volts arcoss them and vintage 1-watt and 1/2 watt carbons and vintage pots and toggle switches </span><br />
<span style="font-family: inherit;"><br />
</span><br />
<div class="separator" style="clear: both; text-align: center;"><span style="font-family: inherit;"><br />
</span></div><span style="font-family: inherit;"><br />
</span><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjT0qCuqoZQAzwaySnGTLgQrsbjQ11i1y_uZdrFfR206mjX4W_vag-EOkqSApObwh0laaL-ZOhZW1hTs9wfK7hQe1lSe2sr7AJzUNNWVHQ_SOC4NPKx3bqmbdWBbylDAipAfk-lu97PGr8/s1600/New_dee_i.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" height="241" n4="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjT0qCuqoZQAzwaySnGTLgQrsbjQ11i1y_uZdrFfR206mjX4W_vag-EOkqSApObwh0laaL-ZOhZW1hTs9wfK7hQe1lSe2sr7AJzUNNWVHQ_SOC4NPKx3bqmbdWBbylDAipAfk-lu97PGr8/s320/New_dee_i.jpg" width="320" /></span></a></div><span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">I like finding vintage toggles that have a great look, like the chrome-plated ones on this amp rather than using Carlings, so the amp is as vintage a possible, including the 50 year old knobs</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhX_wYLTef4QrfjTqS0ZnC5zBXUHKa9FffKMtGbvZ0_TOCGmNhyzzGtfn6joJ8rja_KpB5FAvi-oWp0tutZ5Y9z6jiibjJZAJc84IVdI4WAO5wL2voCBw778ZNTfyIzVeKV7UgO17t3Z94/s1600/New_dee_j.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" height="235" n4="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhX_wYLTef4QrfjTqS0ZnC5zBXUHKa9FffKMtGbvZ0_TOCGmNhyzzGtfn6joJ8rja_KpB5FAvi-oWp0tutZ5Y9z6jiibjJZAJc84IVdI4WAO5wL2voCBw778ZNTfyIzVeKV7UgO17t3Z94/s320/New_dee_j.jpg" width="320" /></span></a></div><span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<div class="separator" style="clear: both; text-align: center;"><span style="font-family: inherit;">Classic Tone transformers were used for a Big Tone Vintage sound </span></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: inherit;"><br />
</span></div><span style="font-family: inherit;">I tested the amp by listening to classic Xmas music through my Vintage Wharfdale and everyone in the shop enjoyed the nice smooth Hi-Fi tone, unlike most bright, hot amps</span><br />
<span style="font-family: inherit;">This amp has Metal-Oxide 5-watt resistors in the cathodes of the 6V6 tubes as the M-O resistors are non inductive and give a much smoother, no grain tone</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">It has a big, bold sound, almost as loud as a amp with 6l6 tubes, using the classic 5E3 circuit with a few very early special circuit tricks that I have found on early version tweed amps</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">I also have built 20 watt versions with 6L6G tubes, the Classic-tone output and the right power</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">Here is a pic of some of the Tweed amps I have built and a pic of a typical Tweed High Power chassis I built back just before 9-11 happened and a lot of small businesses stopped</span><br />
<span style="font-family: inherit;"><br />
</span><br />
<span style="font-family: inherit;">These amps have been in service for over five years with no repairs or complaints</span><br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiRLALFMRCUF5wzXa7pW0JHfDegvq2SZiTP0S72WCufoTC86ZPtXeA0naXFk1ZxX0CJbAqD7u5xIaLcutRZxjszBU1aFkwuB490sQ0CBI3E3j8CfQd9R3PzHyVJej12Wr_CmO6YgeWRzSA/s1600/BTWIN_b.jpg" imageanchor="1" style="clear: right; cssfloat: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="font-family: inherit;"></span></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifTRhQUhaNrkKV_BeWB89ZBIeLIlAFwOm02BOY9h4iuzpSYcSaqVhJNFxL284KtyUQnCmbAsQQQ_LUCDv6vdCbUN_5QM_A22pdxd8cc-stsJzcpu_O6L26AnA6i9sQ7UHV_Nbl5kd8lP8/s1600/Tweed_Amps.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" height="293" n4="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifTRhQUhaNrkKV_BeWB89ZBIeLIlAFwOm02BOY9h4iuzpSYcSaqVhJNFxL284KtyUQnCmbAsQQQ_LUCDv6vdCbUN_5QM_A22pdxd8cc-stsJzcpu_O6L26AnA6i9sQ7UHV_Nbl5kd8lP8/s320/Tweed_Amps.jpg" width="320" /></span></a></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: inherit;"><br />
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<span style="font-family: inherit;">We used Sovetk 5881s and orange drops, but went to Russian Paper-Oil as they have the best sound, more sustain, and much more clarity on chords. These amps ran 100 volts less than everyone's else so they could run four 6V6 tubes as well and were very quiet and Hi-Fi sound</span><br />
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<div style="text-align: left;"><span style="font-family: inherit;">When we were building Tweed amps I sometimes had to get a entire amp together in a week as holdups with parts and other events can cut your time down. You have to be ready to work in a very steady manner so you can get the job finished and tested in time for your customers order </span></div>Shantarhttp://www.blogger.com/profile/02218203108200520935noreply@blogger.com0tag:blogger.com,1999:blog-3839401839101190157.post-45070184918229949262010-12-24T17:31:00.000-08:002011-05-25T23:13:37.353-07:00The surprise Fender Deluxe<div style="text-align: center;"><span style="font-family: inherit;"><span class="Apple-style-span" style="font-size: large;"><span class="Apple-style-span" style="color: #0c343d;">The surprise amp for Xmas, 2010</span></span></span></div><span style="font-family: inherit;"><br />
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<span style="font-family: inherit;">This Fender Deluxe Reverb, solid state amp, model SR 1025, was brought to me by a young guy from Argentina who plays acoustic guitar and blows a blues Harp. I was very surprised to see the amp as I had worked on them in the 1970s and not seen one since.</span><br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixKl8ETUEb_uITJPjdbRRAi97LD_KPNUdP4YQdH10nsg2x3O1f7yjbz20pNhRci9Q_aAFpYXrwOziEW_pU139T9POYWVDvOjQkO-ftlvlWKv75sftZ41OiOFsoJUHQunvtWdSbD6RrJkg/s1600/SS_dee_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" height="320" n4="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixKl8ETUEb_uITJPjdbRRAi97LD_KPNUdP4YQdH10nsg2x3O1f7yjbz20pNhRci9Q_aAFpYXrwOziEW_pU139T9POYWVDvOjQkO-ftlvlWKv75sftZ41OiOFsoJUHQunvtWdSbD6RrJkg/s320/SS_dee_a.jpg" width="240" /></span></a></div><span style="font-family: inherit;"><br />
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<span style="font-family: inherit;">Back around the late 1968 era, I was working for NET Electronics in Downey, CA. This business was in a old Newbury building that is still on Firestone Blvd. One day, the owners came in with a huge pile of these amps and parts from a Fender auction.</span><br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiTBugEsvJWM9IeBMeisUechJz7JoWlnMhgl3m0vDfYNlzYKEYsbIZHROHwMEtuLRNlMOKxXpZ-l9hMe8plNyoKbphKGS6_1vrOtT3nrdw1srY63LY-4dt94fHf7ejycyVCH0WC3t_xH4s/s1600/Dee_amp_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" height="219" n4="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiTBugEsvJWM9IeBMeisUechJz7JoWlnMhgl3m0vDfYNlzYKEYsbIZHROHwMEtuLRNlMOKxXpZ-l9hMe8plNyoKbphKGS6_1vrOtT3nrdw1srY63LY-4dt94fHf7ejycyVCH0WC3t_xH4s/s320/Dee_amp_a.jpg" width="320" /></span></a></div><span style="font-family: inherit;"><br />
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<div style="text-align: center;"><span style="font-family: inherit;">This is the 32 watt amp above and the preamp below</span></div><span style="font-family: inherit;"><br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh48jZKsSGcfuZdBo_s2XNvWeFPtc_do5MbRqaxTQi_FVp7lzgig7mgtjIWFhCYVZcH73bukE6fKH_7nXuSE_GjDW0ssm19JOsR0xA5DkW9TBXteQC4CaBg9EYR6qSMjdDG5_3YUF5K_BI/s1600/Dee_Pre_a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: inherit;"><img border="0" height="176" n4="true" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh48jZKsSGcfuZdBo_s2XNvWeFPtc_do5MbRqaxTQi_FVp7lzgig7mgtjIWFhCYVZcH73bukE6fKH_7nXuSE_GjDW0ssm19JOsR0xA5DkW9TBXteQC4CaBg9EYR6qSMjdDG5_3YUF5K_BI/s320/Dee_Pre_a.jpg" width="320" /></span></a></div><span style="font-family: inherit;"><br />
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<div style="text-align: center;"><span style="font-family: inherit;">The preamp has FET first stages and is very well designed</span></div><span style="font-family: inherit;"><br />
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<span style="font-family: inherit;">Fender had given up on "SS amps" and sold all off, including some very cool Fender spinning echo units that are very rare now. I took the amp parts and built 100 watt heads and four-ten combos with the parts for bands in LA and Long Beach, one of the hot music scenes back then.</span><br />
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<div class="separator" style="clear: both; text-align: center;"><span style="font-family: inherit;"></span></div><span style="font-family: inherit;">I set up a space on the floor and had a "Guitar Amp store" that I ran as I built gear upstairs</span><br />
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<span style="font-family: inherit;">I have a low voltage power supply that is used for many things, including to re-charging electrolytic caps. I took the amp apart, cleaned it all out, and re-charged every cap before bringing the amp up slowly on my variac. I know older SS amps can be full of leaking caps and just blow up if plugged in and turned on. I was pleasantly surprised to find all the caps in this amp to be of very high quality and in mint condition. The whole amp was very nicely designed. As I worked away on a rainy Sunday, I started to get antsy as I worried that the amp would have some bizarre problem that was unfixable or would sound awful, and then no pay.</span><br />
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<div style="text-align: left;"><span style="font-family: inherit;">I was amazed when the amp came up like a baby and sounded great. It has a big warm clean sound like VOX SS amps that puts a lot of tube amps to shame. </span></div><div style="text-align: left;"><span style="font-family: inherit;"><br />
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<span style="font-family: inherit;">This amp was one of the many pieces of gear I have worked on DOA, hoping that whatever genuis I have could get it to come alive again without some un solvable or fixable problem that would mean time spent without pay. When your rent money each month depends on bringing sometimes very rare gear back to life, with no way to find extra parts or info, life can be exciting, or just plain scary as your time to make the rent gets closer each day.</span><br />
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<span style="font-family: inherit;">I was really jazzed when the amp came right up and sounded great! </span></div><div style="text-align: left;"><span style="font-family: inherit;">Also massive amounts of deep reverb sound, great for Jazz or Country Western playing.</span></div><div style="text-align: center;"><br />
<span style="font-family: inherit;"></span></div><div style="text-align: left;"><span style="font-family: inherit;">I had been interested in the older SS circuits as they could have a real smooth tone and more of a Hi-Fi sound than usually grainy harsh new gear. The older vintage amps I work on sound great, but Fender amps after the Tweeds, and Marshalls etc. are very hot and bright, and no bass.</span><br />
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<span style="font-family: inherit;">Most amps now have "Overdrive" or "Lead Gain" type preamps, and are very high gain and harsh.</span></div><div style="text-align: left;"><br />
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<span style="font-family: inherit;">Robert Allen Rissi of </span><a href="http://www.rissonamps.com/"><span style="font-family: inherit;">http://www.rissonamps.com/</span></a><span style="font-family: inherit;"> worked on these amps when he was at Fender and has info and parts for them, and also builds great custom amps.</span><br />
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<span style="font-family: inherit;">The best vintage Transistor amps made back then were the VOX amps like the Defiant, and Conqueror amps. You can and should visit the Vox Showroom and find all the history there. </span><br />
<a href="http://www.voxshowroom.com/"><span style="font-family: inherit;">http://www.voxshowroom.com/</span></a></div><div style="text-align: left;"><span style="font-family: inherit;"><br />
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