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In Reply to: Finally got my OTL apart to check suspected bias shift in one channel posted by Tom Dawson on October 28, 2004 at 09:00:55:
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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Follow Ups
- Re: Finally got my OTL apart to check suspected bias shift in one channel - Lew 10:07:53 10/28/04 (3)
- Re: Finally got my OTL apart to check suspected bias shift in one channel - Legendre 14:08:46 10/28/04 (2)
- Re: Finally got my OTL apart to check suspected bias shift in one channel - Tom Dawson 09:59:26 10/29/04 (1)
- Updates - Tom Dawson 08:48:26 11/05/04 (0)
- Re: Finally got my OTL apart to check suspected bias shift in one channel - Tom Dawson 08:39:40 11/05/04 (0)
- Bias & Offset Circuits updated - Tom Dawson 09:02:02 11/04/04 (0)
- Re: Finally got my OTL apart to check suspected bias shift in one channel - Tom Dawson 13:39:10 11/03/04 (0)
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