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I'd like to try a different rectifier in my phono preamp in place of the originally specified 6X4 (or EZ90). I can't ask the original builder, so here I am...
I seems that the Western Electric 412A -- with a pin adapter, of course -- is a near substitute for the 6X4. That said, I understand that the 412A draws more heater current ... specifically, 412A = 1 A while 6X4 = 70 mA.
Thinking that this might present a problem, I called the manufacturer of the phono preamp's power transformer (DeYoung outside of Seattle) and asked. The company's design engineer told me that the PT's 6.4-volt tap is rated for 2 A. So, his message to me was that even the 412A's higher current draw is still well under limits. He also clued me into the fact that, in general, the designer/builder always over-specified his PTs.
So, I'm fairly confident. I guess I just want, as a double-check, to get a consensus recommendation on whether this is safe and reasonable. I always try to stay within an "original" tube's limits ... and my proposal entails an almost 50% increase in rectifier heater current draw. And maybe this isn't even the only potential pitfall?
Thanks for your help!
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