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In Reply to: RE: Here Ya Go posted by SgreenP@MSN.com on May 24, 2015 at 17:19:56
Not the entire table, just the platter. The two platters share a common bearing post to maintain centering, but the top platter is vertically suspended by magnets from the bottom belt driven platter. The top platter is driven by magnetic coupling with the bottom platter, but they can be turned independently to see that they are not mechanically coupled.
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I wonder about the stability of speed in such a system. ...and yet, Harry must have worked it out. I'm pretty sure all those Classic platters can be updated...I wonder about the rim drive....it would have to drive only the lower platter. I suspect it will remove the vertical noise component, but wonder how much there is of this. If your turntable is sitting on a very solid table on spikes, I don't suspect there is too much noise to remove. We'll see how this progresses. If it works, I'll probably update my table.
I would hazard a guess that you would need to upgrade the whole Classic platter system to a magnetic drive due to the fact that the Mag Platter must have magnets installed, balanced and then mated with the mag drive platter via a more complex bearing assembly.
I would like to see VPI offer a magnetic suspended bearing platter and keep the drive (belt or rim drive) the same.
If the two platter share the same bearing, how are the two platters isolated?
I understand the benefits of a magnetic suspended platter, but not magnetic drive platter system.
I wounder about flutter. Nothing really keeping the two 'tight. And ifthe magnets are strong enough to keep the two parts tight, with no flutter.. Then the magnetic field would be awfully strong up to the cart.
A solution with more issues than cures.
I would want to see exactly how long it takes to get down to zero flutter/between the two halves after changing a record 'on the fly'
I am not knocking VPI.. I just do not see any advantage, and plenty of problems.
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