Hi,
Sure, and as Chevy pointed out, ground-loop hum can originate from a combination of factors. In my own case, with an EP500, I was able to eliminate the ground loop buzz by using an AC outlet that was on an entirely different electrical circuit than my AV receiver, TV, DVD player, cable box, etc. Sometimes the reverse of that will work--connecting all the components to a power strip so they are on the same circuit. But in my experience, about 90% of ground-loop buzz complaints originate with the cable-TV feed.
Years ago, I once fixed a ground loop hum for a reviewer acquaintance but I had to run a separate ground wire from the chassis of his McIntosh power amplifier to a cold-water pipe under the basement/bar sink. He used to have a show on CBC-Radio (English network) called "Gilmour's Albums". I cite that to show the various solutions that sometimes work.
All ground-loop problems are solvable--it just takes some careful detective work.
Alan
