IPod to TV AND Amp - HUM

as soon as I have video to TV & audio jacks to my Musical Fidelity X-150 amp (Apple A/V cable), the low hum is there - I tried S-video to scart/Audio line-out to Amp through a 4th gen dock too, same thing - either on their own work fine though - - i take the TV jack out of TV and leave audio ones in amp, no hum. - - so it seems my ipod to TV & amp simultaneously triggers it - whats up??!
- and if there's any more posts on this in forum, let me know
cheers ears

As a field service tech for a cable company, I have seen this a few times. Generally, it's a not so great ground in the equipment you are hooking up to (your amp.) However, it could be a bad ground to your CATV system. There really isn't an easy way for you to check this. I mean, you could go look on the side of the house to see if it is connected, but you may not know what you are looking for. I'd call the cable company and see if they do free service calls. I'd call and say that you have reasons to believe that you CATV system isn't grounded. Make sure you're at home when the appointment is scheduled for and explain what's going on to the tech. If it is a CATV grounding issue, he has to fix it, per the National Electric Code. Just a FYI, though, in 9 years of CATV work, I have only seen this fix the problem once. As I said before, it's usually the amp itself. Hope this helps.

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