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10th February 2012
| #1 |
| Gear interested Joined: Feb 2012
Posts: 1
Thread Starter | Super Reverb vibrato channel
I have low volume on the vibrato channel. Normal channel is great. Any ideas ? I did notice that pin #1 on V2 is only 179v....not 270v. Doc |
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10th February 2012
| #2 |
| Would-Be-Teaboy  Joined: Oct 2011 Location: Ireland
Posts: 322
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Pin 1 of what? 179 sounds like it's just supposed to be biased around the mid point. Use a little MS paint on this schematic here and show use where on the vibrato channel does the signal get before it stops and the relevant voltages around whatever component it stops at. Oh, and mind dem caps!
__________________ Why don't you just knock it off with them negative waves? |
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10th February 2012
| #3 |
| Lives for gear Joined: Jan 2008
Posts: 1,242
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On an AB763, one rebuilt to correct specs will have a slightly lower volume on the vibrato channel vs. the Normal channel. Same on my Showman. With 40 watts and 4x10's, hopefully it's not that much lower in volume. Go over here instead for much better advice -- it's where I went for answers when rebuilding my Showman and Bandmaster. Fender® Forums • View forum - Vintage Guitar Amplifiers (anything before 1985)
__________________  nedoramaMonkey Boy Studios Summit 2BA-221, TLA-50 mBox Pro 3, Pro Tools 10.1.3 Radial JDI x 2, ProD2, ProRMP '65 Bandmaster 2x12 combo with Dr. Z Brake Lite, '65 Showman, '74 Princeton, '77 Princeton Reverb, Dr. Z. Mini Z Head, Dr. Z 1x12 Cab, pedals, George L's cabling |
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10th February 2012
| #4 |
| Gear maniac  Joined: Nov 2008 Location: Roma, Italia
Posts: 250
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just try swapping first two pre amp tubes, if problem goes to normal channel you have a bad tube
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