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In Reply to: RE: D70 Output Tubes Drifting WHILE Biasing posted by Jonesy on March 24, 2014 at 18:15:35:
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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Follow Ups
- RE: D70 Output Tubes Drifting WHILE Biasing - Lee of Omaha 09:31:25 03/25/14 (1)
- RE: D70 Output Tubes Drifting WHILE Biasing - Jonesy 10:23:26 03/25/14 (0)