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In Reply to: RE: has anyone compared Stereomour II and Fi 2A3 amps? posted by rockdoc on February 28, 2017 at 07:23:57
Who can say which sounds "better", but you?
I do own a pair of Fi2A3 monos and they also do well with 45s with just a change in the rectifier. Don says they sound almost the same as his 45 monos.
Since I bought my monos, Don has switched from Magnequest OPTs to Hashimoto, I think, and I have added an interleaved version of the original Magnequests.
If you are using highly sensitive speakers, I would look into the noise levels of the two brands.
not looking for "better", as with these it's more about different flavors.
Noise is the one concern I have with the Stereomours, at least when AC heated. My current Zu Soul Superflys are 101 db, and do bass (and hum) very well.
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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