David, I haven't fixed mine yet, but I haven't picked up the part that's been recommended. The ground loop eliminator from The Source (ex Radio Shack -
I think this is the one) should be easy to pick up, the only thing is I've been banned from shopping by my girlfriend until after Christmas and my birthday on Jan 9th. Since I mentioned to her that I needed this, I have a feeling it may be wrapped up in a closet somewhere. If the day comes around and she hasn't gotten it for me, I'll just run out and pick one up. For now the cheater plug gets rid of any adverse audible effects (hum), but doesn't seem to help with the visible lines.