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In Reply to: RE: has anyone compared Stereomour II and Fi 2A3 amps? posted by rockdoc on March 01, 2017 at 04:26:41
Fi also uses AC heaters.
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
I don't deny most of what you say, but I have found DC heaters that do produce very low noise floors, without killing the tone and texture of voices and instruments. Some designers do look at (listen to) both. Both are possible with AC and DC. That is my experience as a "listener".
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