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12b4a heater question
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Old 17th October 2018, 01:40 AM   #11
mr ed is offline mr ed  United States
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Join Date: Jan 2009
Location: Willis Tx
Originally Posted by Tubelab_com View Post

AFTER the amp is up an running, if there is objectionable hum, you may try disconnecting the CT from ground and grounding the negative side of the heater supply. In theory it won't make a difference, but theory does not always predict minimal hum.
That was my intial gut feeling, with the 6sn7 it is quiet, I try as is first.

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