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In Reply to: RE: Could I compare test the voltages in pins V3-5? posted by airtime on November 19, 2015 at 06:33:51
I'm sure that Mike does fantastic work but i'd double check under the socket to be sure something didn't fall through the cracks. Did you try any other new tubes besides the New Sensor made ones? Maybe a JJ or Chinese 12ax7 would do better.
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Just the Genelex LPS and the TungSOl.
Oddly enough the Genelex with the spiral filament hums louder/harder (hard to actually describe being isn't a unique hum) than the TungSol.
One more thing to look for, and it's a super long shot, is that the heater wires are tightly twisted going to V5. I hope that you figure this out. I know how frustrating it can be. I have a Citation V with some hum that I can never figure out and I'm too lazy to send it to someone that can.
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