Hum and the PS Audio P300

I had the exact same problem, which was solved by one cable TV guy who knew what to do (no jokes about morons, oxy or otherwise).
He sent me to Radio Shack to get a 75-300 ohm adapter. It is not the one they sell as a "filter," merely an adapter. (I tried the filter and it doesn't help.) I wish I had the part number, but it's not on the piece. It is about 6" long total. It has the male part of the coax as part of a 2" rectangular rubber piece with 4" of antenna wire and two spades extending from it. Then I connect it to a standard plastic antenna to coax converter, which has the terminals for the spades and the female coax. I don't know why it works, it's not made for this purpose, but it does. I have no more hum. When I take it off -- hum! (Hmm?) It costs less than $5. If you can't find it, post here and I'll try and check at Radio Shack for the part number. I hope it works. The cheapest solution to a BIG problem I ever found!

I use the 'ground breaker' on my TV cable between the wall and the TV. I ordered it online from these guys and it works great:

http://www.hometech.com/video/atten.html

Near the bottom of the page:

Xanatech 63400 Ground Breaker $6.95 each

If your cable TV ground is near the electrical service entry ground, tie them together. This should put them at the same potential and minimize any hum. I don't see a problem with doing this, but it might be good to check with a licensed electrician.

"OH GLEN, where are you ???" : ) Sean
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Just been thru this -- Same issues only with a ARC LS-25... My problem was due to 3 issues -- Corrosion on the ground rod and connection to cable ground where cable TV comes into the house (replaced the ground rod and all connection hardware); Found the particular outlet for my HT had a lame connection (grounded with outlet contact to conduit; fixed by purchasing a grounding strap from the hardware store and making a more solid connection); The house ground had alot of corrosion on the water pipe (got new connection hardware and cleaned up the surface with emory cloth); Tied the cable to the outlet ground by using a Monster HTS-1500 power conditioner for the RPTV. After all of this, the ARC is dead silent, the video is perfect, and my stereo has more detail than ever...

Just some things to look at..

As PS Audio gives a 30 day in home trial why not order one and find out. It did wonders for my system. In fact I bought 2 of them.
(PS: I dont work for PS Audio!)