Hum Issues - Rega P-25 w/ Grado Reference Platnum


My friend just put a Grado Reference Platinum cartridge on his Rega P-25. As the cartridge tracks toward the center of the records, the hum increases from non-existant to unacceptable.

Is there anything that can be done about this?

Is it possible to put some type of shielding between the motor and the platter? Or perhaps coat the underside of the platter with a copper-based paint to shield the cart from the inductive interference from the motor?

Has anyone else experienced this?

Thoughts?
128x128nrenter

Showing 1 response by ohlala

There was a Stereophile from way back when that contained an article about covering (part) of the plinth with adhesive mu-metal. It worked, but I don't know whether there was any stubborn residue left by the adhesive. Maybe a Stereophile, Agon, AA or google search could give you more details.

While the P-25 already has speed problems, I'm don't think adding material to the platter would be a good idea. Who knows though, maybe it'll slow it down to what the speed should be. Good luck