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

Put resistors in series with the SS diodes to make them resemble the 6X4. That will allow for safe listening, until the new tubes arrive.

"Ok, so, if the winding could supply 1 amp of 6.3vac , using a voltage doubler on it would only supply .25A?"

You could get a bit more, but 25% is the safe "guesstimate". Also, keep in mind that, less losses, doubling 6.3 VAC yields 17.8 VDC. The losses include the forward drop of both diodes. Schottkys exhibit an approx. 0.5 V. forward drop and are switching noise free. IMO, that's 2 good reasons to favor them. My guess for doubled 6.3 VAC, via Schottky's, is 16.4 VDC.

FWIW, I like doubling a 6.3 VAC winding of adequate capability with 2X Schottky diodes and regulating with a 7812 IC, for 12AX7 phono preamps. A high performance, modest budget, PSU for RCA setups, tweaked or original, can be built around Allied's 6K1VF power trafo. Tie the rectifier winding's CT off and bridge rectify the end to end voltage. Voltage double and regulate the filament winding. While the 1 A. filament winding is a bit undersized for this job, the heat generated (a critical factor) is compensated for by the lightly loaded rectifier winding. Contact "inmate" Jeff Yourison for more details.

Eli D.


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  • RE: Will this work? Switching from 6.3 to 12.6 volts - Eli Duttman 03:52:23 06/12/17 (0)

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