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Hum and the PS Audio P300

I've had a hum in my system for several years. Its no mystery. Its caused by the different ground between my stereo (house ground) and the grounding of my Cable TV's (AT&T Broadband)ground. I've tried spliters and the little box with cable connectors on each end and a dedicated ground. None of that works. I upgraded from a ARC LS2B to a Sonic Frontiers Line 3 and the hum dropped 10db so I've lived with it. The question is I'm considering the purchase of a PS Audio P300 power plant for my CD and preamp's power. Can I expect the hum to go away or get worse? I can terminate the hum totally if I either disconnect the TV cable or isolate the DVD player which is connected to the TV from the preamp.
keis
rbd
1 posts
 
Have you tried a transformer for the cable TV line? Jensen makes one that supposed to get rid of cable TV-induced ground loops.
fast66
2 posts
 
Hi Ken, the ps 300 is part of my system i could not due with
out. I picked one up last year, i dont think it will fix
your problem . On my tv set up with out ps-300,had to
lift the ground on my amp and preamp, was getting ground
loop from cable line because if disconected cable hum
was gon. Try cheeter plug's on amp and preamp,i dont
like to do this but it workes.
Ag insider logo xs@2x
ncarv
983 posts
 
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!
justacoder
66 posts
 
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
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