I get LOADS of feedback on my RG7321..but if u put my thumb on the jack it goes away?? wtf?
it could be to things.....a lose jack socket as in the cable is touching the shielding in the jack so just tighten it up OR you cable is broken (a lose wire maybe) so try it with a different cable if you get the same problem its your jack.....
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Dimebag Darrell.