Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

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Re: Being one of those 'hard nosed' non belivers ...

Posted by rdf on March 10, 2007 at 17:18:05:
PSUD is a godsend but has its limits. Oddball circuits like this push past. With a small L followed by sub- 0.1uf C it's possible to simulate kilovolts from a 200 VAC transformer. It's still useful to put you in the ballpark though, try 14uf. The transformer's secondary is 23 ohms per winding, 209 VAC. I get just over 6 volts from 70 ma to 130 ma (30 ma per SE output tube doubled, 10 ma constant for the two drivers), about 8 1/4 for 100uF. Again, in the ballpark of the measurements. My old EE prof used to tell us calculate for within an order of magnitude of the target and tune the rest by hand. I never bought a product he designed though. ;)

Thermionically addicted.