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Hum Problem with Grado

I recently helped my friend set up his VPI Aries Extended. He is temporarily using an inexpensive Grado ($80 Red?) cartridge but we are hearing significant hum. We grounded the table, which helped, but the hum is still very noticable. Anyone have experience with hum using a Grado and how can we solve this problem? Rest of the system is AR SP16 and VS110 w/ Proac Response 3s. Thanks.
dodgealum

Showing 1 response by redvolt

redvolt
12 posts
 
Same problem for me with my VPI M4 and high output Grado Sonata. Not a huge hum, but motor induced and noticable at high volume levels. I shielded the motor assembly with two layers of mu metal and the hum is pretty much completely gone, I'd say 90% reduced. I could only hear the hum on the last three inches towards the spindle when not actually playing. But you know it's there. Easy to do and effective. A very good tweak for me because the cartridge wasn't cheap. Good listening.

http://www.lessemf.com/mag-shld.html
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