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
Perhaps the silence is telling us something
It may well be?
Whilst we have heard anecdotal evidence that some belt-drive turntables......for instance the big Micro Seikis....can maintain consistent accurate speed according to the Timeline.......I have never seen any visual evidence (via YouTube?) of this?
If anyone can post a clip of ANY belt-drive TT able to do this with cartridge playing and not playing......it would put to bed any doubts?
Lespier,
I run the Final Audio Parthenon ( heavy patter/thread drive/AC motor with reconstructed sine/cosine wave power supply ). Just waiting for the 1st shipment of Timelines to arrive in New Zealand. I'm not losing any sleep, my references for speed accuracy -KAB,Test Record, solo piano stability of notes, and using Digital Sources as a comparison are fairly comprehensive. Oh and forgot I have Technics SP10 Mk3 for comparison as well ( Still not losing sleep ).
Halcro - welcome back. Australian politics has been very entertaining of late. Are you putting your hat in for Foreign Minister ?
Dover,

Good post, I agree there are many, many variables in this game of making a turntable, arm and cartridge right. The other variable is personal taste. I certainly have my prejudices.

Lespier

I'm more interested in how some touted belt drives(SME, Basis, Verdier, Micro Seiki etc) have fared when tested with the Timeline.

Perhaps the silence is telling us something.

We had some very interesting things show up with our Timeline tests.

I've read all the arguments about the Timeline only showing "that" one single revolution, and not what happens to the speed in between.

I get it, but if the laser is moving steadily along the wall in one direction and consistently it seems obvious that speed variation is a fact.

An even more bizarre thing happened some weeks ago during a test with the laser splashing on a wall about 18 feet away.

Anyone interested in duplicating what we did would be welcome. Just play an LP with fairly benign (soft) passage and note the laser position on the wall.

As the needle begins to enter the more difficult and complex musical passages note not only the position of the laser but it's actual "length" as it paints the light.

It finally occurred to us after some time what (I think) was happening. Would love to read reports from others including your conclusion if you do this experiment.
Albert
I'm guessing either the laser mark with the platter having slowed would take longer to traverse a section of wall (unlikely to have slowed enough to make a visible difference IMHO) or perhaps a high frequency flutter is causing the mark to appear longer.... very interesting anyway.

Dover
I should add that I have so far only used belt drive and a Garrad idler(which to me sounds less speed stable than my belt drive...something wrong with it???).
I'm starting to buy the argument for dd though so I may well travel down that path soon.