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Home recording studio - noise with guitar amps - who to call?

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DaveNJ:
Yes, it does change when I rotate it but as you can see in the video, it‘s actually the worst when it’s flat on the floor.

I just reached out to my power company again to request that they assist with locating the source. I think it’s outside of my house, as well.

ebastler:
It seems like that "Bellyarmor" blanket does not act as a shield for the pickup, but rather that it grounds the guitar. (You uncover the pickup in the video and the hum is still gone. Only when the blanket loses contact with the last guitar string, the noise returns instantly.)

What is your grounding scheme there? Is the amp in a grounded outlet? Does it ground the guitar via the 1/4" plug?

It looks to me like one of those connections might be missing. Since you mention that you have seen the problem with multiple guitars and amps, I would check the cables (mains to the amp and audio cable to the guitar) and the power outlet first.

DaveNJ:
These videos were just filmed in a newly remodeled (and inspected) room - all outlets are properly grounded, the amp has a three prong cord, etc..

DaveNJ:
Also, I’ve used multiple cables which all check out with my meter - sleeves have proper continuity…

ebastler:
Have you tried grounding the guitar via some other means than the blanket? Just a wire from any of the (to-be-)grounded parts of the guitar to ground at the amp?

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