Pro Audio Asylum

RE: Ampeg SVT4 pro hum

143.236.92.39

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I have never personally witnessed a tube causing 60cycle hum

I have witnessed and experienced a bad 1/4 input jack/solder connections
causing this
I have witnessed and experienced bass players with a bad instrument
cable going to the input

If he has nothing plugged into the head is it quiet?
Does this hum only occur if he runs a line out /xlr to a sound system?
Does he had a ground defeat switch?

I would suggest looking in other places other then the tubes for this
issue
However, its always a good idea to pull all of the tubes and them
tested and also reseating all the tubes is always helpful



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