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In Reply to: "The Tube Hums At Midnight" and other radio mysteries posted by airtime on November 21, 2015 at 09:54:29:
You could be dealing with an oscillation situation, the newer tubes might have a slightly stronger transconductance...
I have had oscillations cleverly disguised as Hum :>)
Stuben
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- RE: "The Tube Hums At Midnight" and other radio mysteries - Stuben 09:15:29 12/12/15 (0)