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In Reply to: RE: Troubleshooting a JE Labs 300b amp posted by Cpwill on July 10, 2017 at 11:26:40
Would a degrading capacitor in the PS necessarily cause voltage to fall? I saw 4V difference between amps at the PS capacitor-output transformer junction, and the same 4V difference (or very close to that) at the 300B plate. This seems pretty consistent from when I built the amps (circa 2002).
The PS caps are paper-in-oil, and I have not seen any physical indications of leaks.
The 6SN7 cathode cap is a Black Gate. The coupling cap is an oil filled cap (I believe .22uf). All the iron is Hammond (300BX power, 1627SE output, 193J choke)
Follow Ups:
Besides the .22 uF 300B grid cap replacement, I would replace the electrolytic cathode resistor bypass caps with DC Link poly caps. Panasonic, Wima, Vishay brands.
I have a Kemet and a Vishay cap ordered for each amp. I'm replacing the coupling cap with a V-cap.
I should be soldering in a week or two.
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