Least fatiguing 12AX7

SoundMann

Well-Known Member
Jun 29, 2022
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Hi. I am looking for a list of the warmest, smoothest and least fatiguing 12AX7 or electrically compatible equivalents, with low noise types scoring even higher.

Special emphasis should be on tubes that are still affordable.
 
My phonostage has more gain than I need, so I have purchased a 5751 for the v1 gain position.

The 12ax7 will be for the v2 RIAA.
 
I ended up buying a Hammond labeled GE long grey plate fat D getter 12ax7 (v2). I am combining it with a GE double mica support rod grey plate 5751 (v1, don't know what this one sounds like), and an RCA 6201 (v3).

I with be testing these against the stock red-label classic Psvanes.
 
Last edited:
Hi. I am looking for a list of the warmest, smoothest and least fatiguing 12AX7 or electrically compatible equivalents, with low noise types scoring even higher.

Special emphasis should be on tubes that are still affordable.
By the way, what circuit is this for?
 
Im using the French Mazda tubes for linearity. The valvo ones are warm. The tele tubes are very warm.
 
Last edited:
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By the way, what circuit is this for?
An EAR 834p clone. The 5751 had a bad pin. The 6201 screwed up the high frequencies.

I have now settled on the Hammond labeled GE in V1, the stock Psvane Classic in V2, and a later short grey plate GE 12AX7 with a round getter in V3.
 
GaNfet.
 
Are you referring to a smooth plate Telefunken?
I think so. I dont remember which ones i have. I tried two different types but kept only one, with gold pins
 

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