5751, I don't recall the brand. Whatever Frank Van Alstine was putting in his modded-Dynaco PAS pre-amp in the 1980's. Zero hum, and just a hint of tube rush with the volume control at max.
I had a man on the inside at NASA maintenance in the 70s and 80s who provided me with a steady stream of Miltary grade 12AX7WA tubes, Sylvania and RCA, these are the quietest I.e., low noise 12AX7s I’ve tried although Telefunkens are not chopped liver. Even the low microphonic tubes, however, benefit from Herbies tube dampers. So, you’re never totally in the clear.
I use GE 12ax7s circa 60’s and 70’s in my phono preamp and they are dead quiet. I have also used Sylvania Baldwin green label 12ax7s and they are also dead quiet!
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