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Ground loop in arcade cabinet?

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Zebidee:
I doubt that ground loop isolators will solve your problem.

I think you'd be better trying a new PSU.

raidersan:
Ok the verdict is in!

Tried different PSU's, even a brand new expensive one that I got for a PC build, tried a Jamma one too. No difference whatsoever.
A Ground loop isolator stopped the noise like magic. a few quids on eBay. One trick, keep the isolator close to the source. When I had I on the input of the amp, there was still some noise left, but on the output of the RPI, the sound is very clear

Thanks for your help!

Zebidee:
Glad that worked out then.

By new PSU I also meant a completely separate ones for Pi and amp, whatever appropriate :)  It seemed to work for you too in your earlier post. In fact I always setup my cabs like this, separate PSU for audio, to avoid a potential hum. Of course, you could do both separate PSUs and ground isolators! Probably most people won't be able to tell the difference though.

raidersan:
I am back to my old cheap ATX PSU recovered from a 15yr old PC and the ground isolator. The PSU feeds everything which simplifies a lot of things and the sound quality is great!

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