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VPI Rim Drive vibrations

I have VPI SSM with RIM drive and SDS. The issue I'm having is a vibration being transferred from rim to the desk/platter. As the result tonarm wobbles a little bit in azimuth plane.
I tried to replace the brownish rim belt, change contact force/distance between the drive and the platter, and reinstall the belt - the vibration still there (exactly one wobble per rim's full revolution - 360 degrees).

The speed stability is very good though - have checked it with KAB Speed Strobe.

Any ideas how to resolve the issue?

Thanks a lot!
krell303
gja
1 posts
 
Krell303

I went through a similar issue converting my TNT HR5 to a rim drive. My problem was with pitch variations. I ended up replacing the air bladder feet with large brass cones and setting the rim drive pod on a sorbathane/acrylic bed and steel cones. This has made a vast improvement but requires some intermitent tweaking to keep the pitch steady. When it's on - the rim drive totally beats the belt. I'm in Central Jersey if you ever want to compare notes.

Andy
mred
88 posts
 
Anyone compare a silk (or any) thread to the rubber belt and then the Rim Drive. Would love to hear some in-depth analysis.
What would be the bigger improvement.....spending for a Rim Drive or taking the cost and putting it into upgrading from an older Phonomena to a more costly (by that amount) phono section?? Thoughts?
krell303 OP
40 posts
 
Gja, I'm in Central NJ too :-) Is it a Rim Drive country? :-)
hiendmuse
257 posts
 
Here is something I just did which further improved my VPI Super Scoutmaster Ref. rimdrive's performance. I placed a round Symposium Acoustics coupler made of aircraft aluminum between the rubber feet on the SAMA- 1 front and 1 rear, which sits on a Symposium Acoustics Ultra Shelf. The sound further improved with more solid presentation, better staging, more stable.
krell303 OP
40 posts
 
Hiendmuse, after placing the coupler under RIM Drive - have you found any RIM drive's body vibrations caused by uneven rusted belt tension?
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