Quote:
Originally Posted by Crist Rigott
I could boost the line voltage by 10 volts. Would that hurt the filament string?
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I forgot to mention using a Variac. Many will put out 140 volts.
You can boost the B+ by using a 12V heater transformer, rated at around an amp, connected boost. Connect it before the rectifier and you'll just increase the B+, without increasing the heater string.