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Periphery Record Rings

Who uses one of these periphery record rings, like the VPI? Theoretically they make a lot of sense. What is your experience with them?

Has anyone seen this auction over at Audiogon ...

http://cgi.audiogon.com/cgi-bin/auc.pl?accstwek&1235444247&1234963855

It's a brass ring without the outer downward facing "lip" on the VPI ring, which won't work on all tables due to lack of belt clearance. I would guess brass would be better, since it is denser and purportedly results in better sound than other metals. Anyone seen one of these "ttouter" rings and can vouch for the quality of the workmanship and uniformity of it?

thanks,
Bob
ptmconsulting

Showing 3 responses by dgarretson

dgarretson
2,609 posts
 
Hi Bob, we seem to think along the same lines... I may try their brass mat, based upon my recent positive experiences with brass clamps and bearing housings. At 3.5 lbs. the brass mat should contribute both to flywheel effect and to resonance control. But IMO a periphery ring is a PITA.
dgarretson
2,609 posts
 
Bob, I also have the VPI black delrin & lead platter. The thing that got me interested in the brass mat is how much better brass sounds than stock delrin in the feet of my TNT. Who knows how brass will sound coupled to vinyl-- though there are a few high end TTs out there with heroically heavy brass platters.
dgarretson
2,609 posts
 
The physics of a slightly off-center ring flywheel are complex. Even with the inner & outer ring perimeters shifting slightly, the majority of the ring's mass remains concentric. The net flywheel effect may still be superior relative to no flywheel at all. However, like an unbalanced auto wheel, there may be odd resonances at particular speeds of rotation-- but probably not a problem with a flywheel running a slow 33.3RPM.
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