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Diagnosing the DXC-M3A
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06-19-2023, 07:44 AM
kf4rca
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Join Date: Feb 2015
Location: Atlanta
Posts: 741
Don't forget to check the bias light while you're in there. They go bad from age, get black on the inside, and shock (ENG use). That sets black level for the tubes. Otherwise the tube's noise floor is black.
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