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G8HQP Dave · 11th Apr 2019, 12:32 pm

That will provide a somewhat rough DC heater supply. About 1.2V pk-pk ripple, plus switching transients, and about 7.5V DC so overrunning the heater. The likely outcome is a slightly shorter life for the 6AL5/EB91 and replacement of some 50Hz hum by buzz.

11th Apr 2019, 12:32 pm	#12
G8HQP Dave Rest in Peace Join Date: Sep 2008 Location: Solihull, West Midlands, UK. Posts: 4,872	Re: DC filament / capacitor That will provide a somewhat rough DC heater supply. About 1.2V pk-pk ripple, plus switching transients, and about 7.5V DC so overrunning the heater. The likely outcome is a slightly shorter life for the 6AL5/EB91 and replacement of some 50Hz hum by buzz.