maheeinfy
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you might be right. my new Russian Tung-sol 6SN7 hum a lot, but the GE doesn't. But it could also be because the TungSol needs some burn in to get rid of the hum@
maheeinfy
In my experience, it's the driver tube that causes hum, not the power one. Have you been able to swap driver tubes with the same RCA 6AS7G?