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In Reply to: RE: If oscillation is not the problem,... posted by Lew on January 31, 2017 at 10:10:53
Here come the schematic, a differential stage with 100V plate voltage and 5K plate resistor running 20mA per section
Coupling cap is RELCAP RT while all resistor are kiwame except grid stopper using holco
Follow Ups:
The last thing to use in the grid stopper role is a metal film part.
Use carbon composition (CC) parts as grid stoppers. CC is both non-metallic and non-inductive. CC can be noisy, but the noise is related to the current carried. The current in a grid stopper is vanishingly small and noise is a non-issue.
Eli D.
Also try snupping the heater voltages to supres high frequencies there too.
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