Turntable speed measurements for speed accuracy?

Doug,

I agree completely. My answer was simplistic, so that's why I said "halfway there" in my post. There are so many relationships to consider that it is mind boggling. I suppose the real test comes when the stylus hits the record in the presence of experienced, but unbiased listeners.

Regards,
Win

Doug : "Finally, the entire system must be able to overcome the variable load of stylus drag whilst playing real records, an extremely difficult engineering problem. "

There is a name for this, it's called mechanical coupling. I think you are overstating the difficulty of achieving tight coupling, it isn't hard at all as anyone with an idler table can attest.

The difficulty has been getting a motor that runs on speed which is quiet enough to be used when tightly coupled. That difficulty is slowly being addressed through several avenues, some of which haven't reached the market yet.

Mark,

Thanks for the clarity. It is possible to achieve speed stability, as you most certainly know. Still, it is a game of fine tuning that I suppose will always continue to progress. The best we can hope for is a result that doesn't hamper music, and that, like Doug says, is easier said than done.

Regards,
Win

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Just FYI the new Adjust+ software/LP system measures platter speed, wow/flutter, etc. I am about to order one, but there are some options, that are not explained on the the site and I have emailed Chris.

Please report your findings on this software. Sounds interesting...