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In Reply to: RE: Residual AC in the bias supply is .002v posted by DAK on January 15, 2017 at 15:22:48
DAK
Just disconnect the coupling cap going to output tube and run it.You only have to disconnect the cap on one side and you can't play music but you can run the amp at idle to see if it drifts.It may not be your problem but it's quick way to find out.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
If one is bad i can see that as a possibility but both new caps being bad does seem unlikely. Even if 1 cap is bad can it pull the bias voltage down equally in both power tubes?
Even if 1 cap is bad can it pull the bias voltage down equally in both power tubes?Manufacturers do things in runs.If there is an issue with those caps,being they came from the same run no doubt,that can be an issue for both.
It's very simple to do that test and get it out of way.That may not be your problem but newer oil caps have had issues at times,including the Jensens.There may be cases where the oil has become conductive for whatever reason. You have built these amps several times and this is the amp you are having trouble with. I would try the caps. Just disconnect one side of each cap and run it and that way you will know.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 01/16/17
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