Cable TV receiver induced hum into system

If you disconnect the cable TV feed does the hum go away? If the cable TV feed is the problem try a Xantech 634-00 Ground Breaker. I read about it in another Audiogon forum discussion and it worked for me. Less than $10 if you look around.

I had the same problem with my cable hook-up, and I too used a Mondial Magic to break the ground loop and improve the picture. It's an excellent product! :o)

I'm away from home. I'll check which ground makes the difference. I've been looking on line for a Mondial Magic and don't find one. Any ideas?

http://www.amusicdirect.com/products/detail.asp?sku=AMONDBOX
Google has many other hits for "Mondial Magic".
If you want to be sure this is the problem, a cheap way would be to go to radio shack, and buy 2 75-300 ohm baluns. The kind you used to use to hook up cable tv to an old tv with just antenna screws. Take the 2 baluns, and hook them together by the wires. Either clip off the spades and just twist and tape for this experiement, or you could just use screws and nuts.
Now plug your cable feed into one end, and run a new cable from the other end to your cable box. If this eliminates the hum, you have found the source of your problem. Then you might want to spend the money on the Mondial.
John

Here is a link to the baluns from Radio Shack:
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F003%5F010%5F001%5F000&product%5Fid=15%2D1140