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RE: D70 Output Tubes Drifting WHILE Biasing

I like the hypotheses about the coupling caps and the bias pots. If they turn more easily you definitely got some in there. AND you saw some improvement. Try cleaning again. If that doesn't work try replacing one or more of them.

We had a preamp in once that I cleaned the hell out of the balance pot, and it would play properly for a while, then get noisy. To make a long story short, after about 5 cycles of cleaning/working/noise I replaced the damn pot. That fixed it. Learned my lesson--not everything will clean.

Lee

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