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Re: Finally got my OTL apart to check suspected bias shift in one channel

I think that as tubes age, the grid to cathode voltage difference (i.e., the bias voltage) tends to go toward zero, if all other factors that determine bias remain constant. So your finding that the bias voltage has drifted "upward" (i.e., to a higher negative number) does not suggest to me that the output tubes are failing. Rather, I think something has changed upstream from the output tubes that are exhibiting a higher bias voltage.


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