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Re: Don does use AC on 45 based amps

Hi yall,

Here is the deal folks, with a 45 or 2A3, you have a 2.5 VAC filament voltage and you CAN use AC, which DOES sound better than DC, on those tubes.

With a 300B you have a 5 VAC filament voltage, too high for AC, so you are FORCED to go with DC, a compromise. But then, a 300B tube always was and IS a compromise in many ways to a 2A3, so, the best SE amp you can build is not a 300B, but a 2A3, run at lower current, about 45 mA instead of 60 mA., and with AC heating on the 2A3. Its HARD, no, impossible, to beat a GOOD 2A3 amp folks.

If your speaker requires more power than a 2A3 can provide, junk em and get more efficient ones....smell de roses.

Jeff Medwin

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