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-   -   12 VAC for both AC heaters and DC B+ via voltage doubler? (http://www.diyaudio.com/forums/tubes-valves/215139-12-vac-both-ac-heaters-dc-b-via-voltage-doubler.html)

MarkER 25th June 2012 05:36 PM

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.

Austin Translation 26th June 2012 08:04 AM

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.


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