Certainly a viable alternative to the 845. I think the PP circuit will take care of filament hum. I certainly have gotten nothing bad from advancing from 2.5 to 6 to 12 in my DH stuff. I don't think increasing to 20 will hurt much.
6k6 a-a with U-L/E-Linear drivers and 813's at 750V/120 mA is another interesting prospect. I just need to get a good 6k6 OPTx. It remains to be seen if my 20W model is going to be properly scaled up.
for filaments, a 22V/5A tx with a variac on its primary will allow powering 813's to the 20V Russian filaments with the twist of a knob. regards, Douglas
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