I would first try redressing the cables. My 'table will do the same exact thing, sometimes.
Then, try running an additional ground wire from a non-moving metal part of the tonearm to your ground at the preamp. That's worked for me, before, too.
I think your leads may be acting like an antenna. But, I don't really know how this stuff works, to be honest.
Then, try running an additional ground wire from a non-moving metal part of the tonearm to your ground at the preamp. That's worked for me, before, too.
I think your leads may be acting like an antenna. But, I don't really know how this stuff works, to be honest.