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Old 25th June 2012, 05:36 PM   #1
MarkER is offline MarkER  United States
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Default 12 VAC for both AC heaters and DC B+ via voltage doubler?

I've built small guitar amp using space charge tubes:
Sopht amps - all tube 30v amps
I was using parts on hand and have a 12 VAC/3500 mA wall wart. It works great on the heaters that use plenty of current, but was wondering if I could also run a voltage doubler to give the 24VDC for the B+. I realize that it will generate more than 24VDC, but would bring it down with a suitable dropping resistor. Currently using 3 9V batteries in series for the B+.
Thanks in advance.
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Old 26th June 2012, 08:04 AM   #2
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I wouldn't worry about the dropping resistor, it's going to sag. A voltage doubler puts off a pretty chopped up form of dc and rc filtering will fix it but it's going to sag some with any load at all on it.

Last edited by Austin Translation; 26th June 2012 at 08:07 AM.
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