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In Reply to: Does this drifting occur with only the phase inverter and output tubes? posted by FenderLover on April 9, 2014 at 00:38:09:
Thanks for all the advice. I've attached some pics. Am I reading the advice correctly?
Mike, I haven't tried the coupling caps. Which would they be? Top or bottom of amp? (See pics.)
Steve, Mike, I will try the shorting caps and report back.
Fender Lover, Bias is steady when only the output, power, phase inverter and one small tube (12ax7) which I believe is part of the power supply, are in. Put the driver and signal tubes into one channel will affect that channel only (drifting).
So the 4 across at the front, which are the 2 matched pair output tubes (6550C), the power tube (6550C) at the back center, and the aforementioned 12ax7 just to the right of the power tube. The phase inverter (6DJ8)is near the back just to the left of the power tube.
Then I have a row of 3 tubes per channel, 6DJ8, which I understand the first two are driver tubes, and the very last one at the back is the signal tube.
Are you suggested having both channels of driver and signal out, then putting in a driver tube one at a time, check bias, another driver, then eventually signal tube. Starting with one channel then the other?
Thank you everyone for your help!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
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Follow Ups
- Mike, Steve, Fender Lover - Jonesy 09:04:34 04/09/14 (16)
- RE: Mike, Steve, Fender Lover - Michael Samra 11:26:09 04/09/14 (15)
- RE: Mike, Steve, Fender Lover - Jonesy 12:25:05 04/09/14 (14)
- RE: Mike, Steve, Fender Lover - Michael Samra 13:30:02 04/09/14 (13)
- Shorting plugs in... - Jonesy 16:38:49 04/09/14 (12)
- That's unfortunate... - Steve O 18:32:10 04/09/14 (1)
- RE: That's unfortunate... - Jonesy 19:00:41 04/09/14 (0)
- Answer me this - Michael Samra 17:24:11 04/09/14 (9)
- Dead Silence - Jonesy 17:57:21 04/09/14 (8)
- Ok then here is the schematic - Michael Samra 04:41:39 04/10/14 (7)
- 1K Resistor Location? - Jonesy 14:55:19 04/10/14 (3)
- Can't find any 1K resistors - Jonesy 17:59:44 04/10/14 (2)
- RE: Can't find any 1K resistors - Michael Samra 09:25:02 04/11/14 (1)
- RE: Can't find any 1K resistors - Jonesy 09:50:20 04/11/14 (0)
- Ah man. I want to stay home from work... - Jonesy 06:03:19 04/10/14 (2)
- RE: Ah man. I want to stay home from work... - Michael Samra 13:01:03 04/10/14 (1)
- Was a time... - Jonesy 13:30:41 04/10/14 (0)