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Filament hum

5. Filament supply for the 845. 60Hz if it's AC

That's not correct, at least not in tubes with large filament structures like the 211 and 845. Those tubes also generate considerable harmonic energy at 120 Hz. I first discovered this when I built a circuit attempting to null the 60 Hz in a 211 amp. It worked, but there was still too much 120 Hz energy. I eventually discarded the whole idea. It seemed futile to try to duplicate the entire harmonic signature being created by the filament for purposes of nulling. That was when I moved to DC, and later to ultrasonic heaters.



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