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

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jonpaul:
See library of Jim Brown and Don Davis,  at SynAudCom, excellent papers and tips

https://www.prosoundtraining.com/

Jon

magic:
I have no experience fighting with low frequency magnetic fields, but people say that they are a bitch to block, basically requiring thick solid steel or stuff like that.

OTOH, the behavior you show is perfectly consistent with (perhaps unusually strong) electric field. These fields are stopped simply by surrounding the sensitive circuit with any reasonable conductor connected to the circuit's ground. It looks like something internally at the back of the guitar is receiving the noise. I guess that sticking a layer of aluminium foil to the back (maybe even a small patch in a particular location) and grounding it would be all you need. This should have been done internally by the manufacturer, I suppose, and still could be done if it's possible to take the guitar apart and access whatever electronics are inside.

You tried an experiment with putting the blanket on top of the guitar and it was found ineffective, you may want to try the same with the guitar upside down. This would confirm if it's the particular side of the guitar or separation from the floor that makes the difference. I expect the former.

No idea why your location is so bad. The source of electric fields is voltage, and the source of strong AC electric field is high voltage AC.

DaveNJ:

--- Quote from: magic on November 21, 2022, 07:11:25 pm ---I have no experience fighting with low frequency magnetic fields, but people say that they are a bitch to block, basically requiring thick solid steel or stuff like that.

OTOH, the behavior you show is perfectly consistent with (perhaps unusually strong) electric field. These fields are stopped simply by surrounding the sensitive circuit with any reasonable conductor connected to the circuit's ground. It looks like something internally at the back of the guitar is receiving the noise. I guess that sticking a layer of aluminium foil to the back (maybe even a small patch in a particular location) and grounding it would be all you need. This should have been done internally by the manufacturer, I suppose, and still could be done if it's possible to take the guitar apart and access whatever electronics are inside.

You tried an experiment with putting the blanket on top of the guitar and it was found ineffective, you may want to try the same with the guitar upside down. This would confirm if it's the particular side of the guitar or separation from the floor that makes the difference. I expect the former.

No idea why your location is so bad. The source of electric fields is voltage, and the source of strong AC electric field is high voltage AC.

--- End quote ---

Thanks - you're correct, flipping the guitar over does not provide a full cancelation until I wrap the fabric up over the top (back of the guitar) as well. I think I show this in one of the videos...

jonpaul:
get a better guitar pickup, hum bucking

j

DaveNJ:

--- Quote from: jonpaul on November 22, 2022, 03:21:25 pm ---get a better guitar pickup, hum bucking

j

--- End quote ---

It is.

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