Don't try to plug a polarized 2 prong A/C connector in backwards and don't use one of those little ground lift adapters.

You are experiencing a ground loop. As stated above there are many reasons this could be happening, but defeating things related to A/C safety is not the way to correct the problem.

Everyone should carry at least one of these with them to every gig and a couple of these . I never leave home without them. They have saved the day (or night) several times during concerts.

Best Regards,

Dave


------------------
Wm. David McMahan
Nat'l Product and Support Manager
Generalmusic USA