My guess is it was Almarg, who often suggests Jensen products and always offers sage, well grounded advice. Glad it worked! I may try the parts xpress version on my cable inputs in my house too.
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Swanny, thanks very much for the compliment. It wasn't me, though, as I haven't been a member for nearly that long. It might have been Jea48 (Jim), who has recommended the Jensen version of that device a number of times in comparable situations. He is also the leading expert here on electrician type things.
I agree proper grounding is important. And I would urge everyone with CATV to make sure the CATV cable grounding block is grounded properly.
The CATV cable grounding block per NEC shall tie, connect, to the main grounding system of the electrical service. Problem is NEC allows CATV companies many options where they can make the connection in my opinion. And NEC could care less about ground loop hum on an audio systems.
In this case NEC concern is lightning protection.
So the block could be grounded per NEC code and a difference of potential could still exist between the shield of the CATV RG6 coax cable and the branch circuit safety equipment grounding conductor.
If calling the CATV provider fixes the ground loop problem great.... If it does not install the ground loop isolator.