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You might have to move some tubes around to get the DC balance

Posted by Ralph on June 7, 2016 at 11:43:59:
There does not appear to be a separate bias adjustment for each power tube. So you do have to get the tubes to work together. For example if two power tubes are weak, you may not want them to be in the same bank of power tubes. That may be why the one channel is a little off.