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Re: shared versus separate filament suppies....

Now in a push pull Class A amplifier with a filament transformer and a hum pot for each output tube, assuming the tubes are matched in terms of gain and idle current for a given bias, the wipers can be tie to a common cathode resistor. This has the advantage of eliminating the need for a cathode resistor bypass cap while still being able to null out the hum. One less cap in the signal path is always a good thing.

With single ended output, the cathode resistor bypass cap is unavoidable and 100% in the signal path.

Tre'
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