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Single Ended Triodes (SETs), the ultimate tube lovers dream.

AC on 2A3s.

AC heaters on a 2A3 at 2.5 VAC sound better than DC, and myself and others, ( DrummerWill, Serious Stereo, etc etc etc ) have no problem running 2A3 JJs, etc. with AC filament noise-wise, on ALTEC or GPA High Efficiency speakers.

Many a potentially good sounding circuit is ruined, when the designer makes lowest noise measured, the priority. The complex cure, on a 2.5 VAC Ef DHT, is worse than the original problem. In fact, that is one of several reasons why one should use a 2A3, because it HAS a 2.5 Ef voltage requirement, VS, say, a 300B, etc.


Two more mono amps to build. Am designing a new power transformer next week, out of M6, to do DCed 2A3 types of circuits. Fun stuff.

Low Mu....Jeff Medwin



Edits: 03/02/17 03/02/17

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  • AC on 2A3s. - drlowmu 07:06:11 03/02/17 (1)

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