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I've a Martin 00-15E Retro with inbuilt electronics by Fishman (F1 Aura Plus ).

Noticed recently that the guitar had developed a bad earth hum and buzz.

Removed the strings and saddle and checked at the red ust, it looked ok but the hum was still there. So, gently, took the ust out just to check if there were any cracks on the red foil and suddenly the noise stopped. Strung the guitar again and all seems good.

Did someone have this trouble with this type of pickups? Would it be a good idea to wrap the ust with some copper foil on top of the red one?

Thanks.

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    I'm voting to close this question as off-topic because this is a musical instrument repair question. Nothing at all to do with sound design. music.stackexchange.com and tag it "instruments". – Mark Nov 4 at 5:41

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