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In Reply to: RE: Thanks Mikey - ECC99 are huming nicely posted by banpuku on February 12, 2017 at 14:28:39
Pat
You can dial that JJ tube in for a lot more power if we raise the B+ to around 450v.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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What's the operating conditions you suggest for a lot more power? I have JJs too, may want to try the maximum power condition some day .
The JJ 2A3-40 can handle 450v as I recall and boosting the B+ is the first thing he would have to do.The other night when I was helping him,the ECC99 was drawing 35ma.That told me we had to raise the cathode voltage by adding more LEDs and then it dropped to 21ma but also,he was only running 243v between the plate and cathode of the 2A3 so we had to raise the B+ to at least get it to a 250v potential which he did.The first choke went to the 2hy 35 ohm tap and that helped with that.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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