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RE: Will this work? Switching from 6.3 to 12.6 volts

You can't use a voltage doubler, with that filament winding. When a winding is rectified and cap. I/P filtered, only approx. 1/2 of the AC RMS current is available as DC. A doubler is even worse. Only approx. 1/4 of the AC RMS current is available as doubled DC. TANSTAFFL! Your current needs are halved by switching to "12" V., but the necessary current is not present.

As a temporary expedient, until a known good 6X4 is acquired, use 2X UF4007s in series with dropping resistors.

Eli D.

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