watchnerd
Grand Contributor
Here are some real world scenarios and my hum experiences:
TT -- ground --> Devialet = no hum
TT -- ground --> SUT -- ground --> Devialet = no hum
TT -- ground --> SUT -- ground --> tube phono -- ground --> Devialet = hum
TT -- ground --> SUT -- [bypass tube phono ground wires] -- ground --> Devialet = no hum
What's going on here?
I assume it's a ground loop due to potential differences, but I'm not understanding why the tube amp seems to be the culprit.
Why does bypassing the ground connection for the tube amp make ground better?
Is the big fat tranny on the tube amp causing EM induction in the ground wire?
And is this optimal, or is there a better way to do things?
TT -- ground --> Devialet = no hum
TT -- ground --> SUT -- ground --> Devialet = no hum
TT -- ground --> SUT -- ground --> tube phono -- ground --> Devialet = hum
TT -- ground --> SUT -- [bypass tube phono ground wires] -- ground --> Devialet = no hum
What's going on here?
I assume it's a ground loop due to potential differences, but I'm not understanding why the tube amp seems to be the culprit.
Why does bypassing the ground connection for the tube amp make ground better?
Is the big fat tranny on the tube amp causing EM induction in the ground wire?
And is this optimal, or is there a better way to do things?
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