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RFI from steel TV bracket?

Yesterday I installed a new TV on a steel wall-mounted extendable bracket between all my electronic components.
I now have a low hum/buzz from both speakers on all sources....even with the preamp on mute?
When I switch the preamp off.....the hum is still there.
The only way to remove the hum is to switch the amps off?
I tried grounding the steel bracket to the preamp and then the amps without success.
The previous TV was in the same location but sitting on the shelf.....not a steel wall bracket.
Any help would be dearly appreciated?
128x128halcro
atmasphere's avatar
atmasphere
12,038 posts
 
Sounds to me like you have more troubles than you thought.

So let's go back to the time you installed this bracket thing.

What *other* changes did you do?
halcro's avatar
halcro OP
2,664 posts
 
What *other* changes did you do?
No other changes :^)
atmasphere's avatar
atmasphere
12,038 posts
 
What happens if you unplug the interconnects from the inputs to the amps? Do they still buzz?

Right now I'm sticking to my original theory, only substitute 'interconnects' for 'speaker cables', and since the ICs are single-ended, this makes a lot more sense.
halcro's avatar
halcro OP
2,664 posts
 
When I unplug the output from the pre-amp......the hum is still coming from the speaker.
But when I unplug the input to the amp (with the output still connected to the preamp)......the hum disappears :^)
If you're right.......any solutions other than removing the steel wall bracket?
Thanks
Henry
hifihvn
943 posts
 
But when I unplug the input to the amp (with the output still connected to the preamp)......the hum disappears
I still think there is a possibility that the interconnects that go from the preamp to the amp my not be shielded enough for the new environment. Try a different pair (if you haven't already) between these two (amp and preamp) that may have better shielding, or a different design. Last resort (don't laugh), even some budget ones from Radio Shack, or even a big box store just temporarily to see if this can be the problem.
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