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Original Message
RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed
Posted by Alpha Al on July 15, 2017 at 13:56:08:
I've had good results with TungSol 6U8 (original, not reissue).
A lot of 6U8's hum from heater to cathode leakage in the pentode section, old TungSols usually do not.
There are some 7199 to 6U8 adapters available, also so you don't have to rewire.