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RE: D70 Output Tubes Drifting WHILE Biasing

Posted by Michael Samra (D) on March 23, 2014 at 22:15:12

In Reply to: RE: D70 Output Tubes Drifting WHILE Biasing posted by Jonesy on March 23, 2014 at 13:56:17:

The bias drift you have between the tubes is so minimal that it will have little if no effect.If coupling caps to the output tubes have the slightest amount of leakage,that can cause drift in your bias..I am more inclined to believe that you may be picking up a little RF generating from the signal tubes.
Take out the preamp signal tubes or even the driver tubes and then set the bias after being on for 30 minutes or so..Then recheck it with the tubes still out..If it holds,one of the small tubes could be oscillating and you may need to shield it better.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

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