The quietest tubes I have heard are the McIntosh branded 12ax7 tubes that came with my McIntosh C2500 preamp. Dead silent, even with the volume control at max, not a peep from the speakers. Not sure who makes the tubes but my guess would be JJ?
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.
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