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In Reply to: tell when tubes need replacing w/ auto-bias amp posted by mjcmt on March 25, 2020 at 07:13:16:
Usually with active circuits like that the indication is in the drifting grid voltage. The tricky part will be how you measure it. But if you can figure out how, then keep monitoring it, and when you see it begin to change by significant amount, then you have you answer.
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- RE: tell when tubes need replacing w/ auto-bias amp - Victor Khomenko 04/2/2011:45:42 04/2/20 (0)