[TV MAN]

Ron, perhaps I misunderstood. I thought that you were building the bias adjuster because the tubes were red plating. I mentioned this that the original problem may have been weak tubes (before building the bias circuit).  Anyway, I do like the idea of separate adjusters. Had this problem on an amp some years ago and found the tubes were weak and couldn't handle the current anymore. New tubes fixed. Anyways, is why the mention. Glad you have the problem solved!