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Questions about tubes and gear that glows. FAQ

Mike, Steve, Fender Lover







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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