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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
lewm
13,057 posts
 
God never meant for audiophiles to have a warm and fuzzy moment. If an audiophile is not worried at any given moment, he is compelled to search for something to worry about. Enter, the Timeline.
dinster
76 posts
 
I notice very few, if anyone, is using a test tone and measuring frequency, as a means of setting TT speed. My limited experience is that the KAB disc is pretty insensitive, I have an AC motor and so the KAB disc shows perfect speed, however the 3150 test tone measured with the Feickert App, shows fluctuations of up to 5 Hz from a mean of 3150, after I have adjusted the power supply. The test tone takes stylus drag into account. So what are the issues with this method?
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albertporter
4,949 posts
 

So what are the issues with this method?

I kept hopping someone else would chime in. I have the Feickert App and the Feickert LP but also have the new Quality LP from Chad (Ultimate Analog Test LP, track 10) that both work with Fozgometer.

Test result is different with each test record and I don't want to get into multiple page (guessing game) explanation as to why.

The Timeline shows what's happening very easily and quickly with minimal hassle. I'll continue to test but the results with iPhone are dubious.
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albertporter
4,949 posts
 
Clarification of my post (above).

I bought the Ultimate Analog Test LP for the Fozgometer and found track 10 worked with the Feickert iPhone App.

Both it and Feickert test disc have the steady state 3150 HZ test tone.
oldears
386 posts
 
I have checked my VOM with the Rives test CD and it reads +_ 1 hz at frequescies from 1000 to 3150 hz, so I think I will buy the Ultimate Analog Test LP to cross-check my strobe disk. I also happen to have an old dual trace scope, so I should also be able to set azimuth from the same diak. No often I can "kill 2 birds" with $40.
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