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In Reply to: RE: Any approach we can make 6h30 warmer and richer? posted by Eric Chan on January 30, 2017 at 03:44:02
perhaps you might let the rest of us know what voltage and current you are supplying to the tube and what value plate and cathode resistors. Some of the gurus here may be able to help you more if you divulge that sort of info. And finally, as Mike Samra intimated, coupling capacitors have an outsize effect on the perceived overall coloration. So, what type of coupling capacitor are you using?
Follow Ups:
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
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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