I just received my new Ampeg PF-20T and it has a loud 60Hz type hum that goes away when I touch my strings or other instrument metal pieces. I've tried various instruments to no avail. Is this a known issue? Is mine particularly defective? Thanks!
Try a different bass, this is a classic symptom of a bridge that's no longer bonded to the signal ground within the bass. You are operating your amp on a grounded power circuit?
I am (grounded power circuit). I have tried 5 basses and 2 guitars... (also, these instruments do not exhibit 60Hz hum with other amps).
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