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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
dover
2,262 posts
 
Hi Albert - no that sounds fine. The engineers modus operandi is that he overbuilds everything, which is great. I have heard the SP10 mk3 but unfortunately in a system, which although I have followed the evolution, I don't know what is doing what. That's why I'm interested in your feedback. Your bearing mod makes sense to me, wicking the energy away. There may be advantages to your solution in that if the energy is higher up the frequency scale a harder conduit ie the rod into the lead may be more effective than just sinking the bearing directly to a lead block. Unless we AB it we'll never now. The electronics should be fine if Bill is OK. Good luck.
albertporter's avatar
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albertporter
4,949 posts
 
Thank you Dover.

Bill says the mods should make the transformer, motor and sense coils more reliable (longer life) so even if there is no appreciable performance upgrade it's still a worthwhile venture.

If it sounds better I'll be doing the victory dance.
dover
2,262 posts
 
Hi Henry -
Have finally managed to try the Sutherland Timeline on the Final Audio TT ( heavy mass - platter 19kg, string drive ( single silk thread ), AC motor driven by oscillator preamp( reconstructed sine/cosine waves) and power amp.

Testing with and without the record playing I have to adjust for stylus drag.
Both the KAB and the Timeline show the stylus drag. The net movement of the laser with stylus drag is about 2mm on the wall per rotation.

If I correct for stylus drag with the KAB then recheck with the Timeline it is spot on.

With record playing the Timeline is spot on as per the KAB.

Conclusions are I can sleep at night, and the KAB, or at least my one, is as accurate as theTimeline.

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halcro
2,664 posts
 
Hi Dover,
Congratulations. Good to hear :-)
lewm
13,318 posts
 
"2 mm on the wall" is meaningless, unless you tell us the distance from spindle to wall surface, but in any case it sounds like the effect of stylus drag is very tiny, probably not audible and probably not worth worrying about. Unless I misremember some of the earlier posts, it sounds like the Final Audio, as you have equipped it, is among the best of the belt-drives in terms of resisting stylus drag.
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