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In Reply to: RE: I just saw that you are having problems with Beveridge amplifiers posted by AJ on June 24, 2024 at 05:17:07:
AJ, On that same one of my two amplifiers that was oscillating, I not only inserted that 100R buffer between the cathode and the filament on (I think it was) V202, but I also installed a separate 36V transformer specifically to replace the filament supplied to that one tube (V202) from the Bev PT. In fact, bypassing the filament supply from the main PT to V202 (one of the three separate 36V filament supplies that come off the main PT, as you know) did the most to reduce oscillation. But the coup de grace for the oscillation was adding that 100R resistance. My other amplifier has no such problems, I think because somewhere in its life before I got it, it received a new PT. Certainly it's newer than the one having problems. Yes, I agree there seems to be leakage between the HV tap and especially this one of the three filament supplies.
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Follow Ups
- RE: I just saw that you are having problems with Beveridge amplifiers - Lew 14:39:40 08/17/24 (0)
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