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
Hi Albert,
I have seen exactly that phenomenon with the Timeline on the Raven AC-2 driven by a slipping thread.
I know exactly what is happening and it is borne out by the laser mark AND the sound at the very same time.
The Timeline is its own reward :^)
I sent the amateurish YouTube video of my TT-101 with the Timeline to Ron Sutherland who was so impressed....he said he was going to include a link on his new web site.
Ahhh....fame at last :^)
Halcro,

I assumed the same thing you did and heard the result as reduced dynamics and slurring. Funny you detected the same phenomenon.

I agree, Ron has a winner, http://www.positive-feedback.com/Issue58/awards2011.htm

Scroll almost to the bottom.

I gave Ron Product of The Year for the Timeline. I'm pretty sure I stirred up some of this when I began posting results of my own tests last year.

The Timeline may not be a "perfect" product but it sure reveals errors that a printed disc and strobe miss. I would go so far as to suggest the Timeline supports things we hear and previously could not prove.
If the laser light stays in exactly the same place on the wall as the platter rotates but the "line" created by the laser beam gets longer, then it is at least possible that the tt is momentarily gaining speed above 33 rpm (assuming the flash of the laser is of constant duration, which is a fair assumption). But the fact that the light does not move left or right indicates that "average" speed is maintained. This is one explanation that comes to my mind; I have no idea what you are thinking, Albert and Henry. I would be interested to know.

It seems to me if the tt slows down momentarily, the laser spot would shrink, not lengthen.

Albert, I take all your points in support of the NVS, but the bottom line is what do you think of it in action? Does it blow away your SP10 Mk3?
Who ever suggested the NVS was better than any other tt was just full of hype, just more marketing blah! blah!

What I can't figure out is how does a table that list for $25k just a short while ago then jump up to $40 and now $45 or what ever.

That new wooden shipping crate must have added some serious sonics, possibly no more bent platter bearing :-)

Who in thier right mind designs and manufactures a table costing this much and then ships it with the platter attached, makes no sence.

I may have missed but has there been any mention of any owners using the TimeLine on it and the results.

Albert P, we know you have one so what are the results.