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Original Message
RE: New Tubes (6CA7)--now bias too high
Posted by jsblock on May 5, 2016 at 04:56:04:
One other thing to check is your line voltage. Ours recently changed from 117 to 125, and I had to change the bias resistor to compensate.
Your EL34's bias ok, so maybe this is not the issue, but it's worth checking.
I just made a bucking transformer to bring the line voltage back down to 110. Now the bias voltage is a lot lower.