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Turntable speed accuracy

There is another thread (about the NVS table) which has a subordinate discussion about turntable speed accuracy and different methods of checking. Some suggest using the Timeline laser, others use a strobe disk.

I assume everyone agrees that speed accuracy is of utmost importance. What is the best way to verify results? What is the most speed-accurate drive method? And is speed accuracy really the most important consideration for proper turntable design or are there some compromises with certain drive types that make others still viable?
peterayer
atmasphere's avatar
atmasphere
11,807 posts
 
However, he did also comment that with a true 3-phase AC synchronous motor controller (so you can throw away the phase-splitting capacitor), the Papst would have been MUCH quieter and therefore might outperform the Thorens motor in all other respects. So, Ralph, have you ever used such a motor controller with your Atmasphere [sic] 208 turntable?

Hi Lew, If the motor was noisy then its likely that there was some sort of defect. All I have ever heard from them is a hiss related to the air moving around the rotor. In my application it is isometrically mounted, so noise simply isn't an issue. What I have heard about the controllers is they are used to get greater stability than the AC line offers, but I am dubious about that- the AC line is quite stable!
in_shore's avatar
in_shore
596 posts
 
Dertonarm
Fascinating and of course your table would be something to experience even though I could never afford it along with associated components.
Have you now or are you planning a web site for your products?
lrsky
1,118 posts
 
Lewm,
Been thinking about your 'what turntable' question...
It may have been an Oracle...it's been a long time...sorry.
The tables of note then were, as I said, Linn, SOTA, Oracle...no doubt a few others, but they were, in my little part of the country the bigger names.

Larry
lewm
13,056 posts
 
Ralph, By all accounts, a really accurate subdivision of the phases plus really accurate control of voltage and frequency can render a major noise and vibration reduction in 3-phase AC synchronous motors, but my disclaimer is I don't know nuthin'. I am mostly quoting the teachings of Mark Kelly.
dover
2,243 posts
 
Lrsky/Lewm - my money on an 80's demonstration by Magnepan would be an Oracle Delphi tt with the Magnepan unipivot tonearm, this was a popular combo of that era in the US if you weren't in the Linn/Sota camp.
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