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
"One point not properly addressed so far.....is how idlers or rim-drives perform against the Timeline?
Perhaps Lew will be able to enlighten us on this?"

As a idler user I would appreciate Lews results on his Lenco. I would also appreciate how his DP80 performs, you would think it would be spot on as the TT101. Halcro have you tried the timeline with your TT81?
Henry - my post was not an assessment of the DD technology as you know.

It was strictly my theory based solely on what I have heard/read here about this timeline and how I think either of my Technics SP10 MKII's would do up against it.

Speed corrections are made very quickly with my SP10's - I do not think they would therefore register with the device. If someone in my area wants to lend me a timeline I will try it as well.

The SP10 MKII's are both "very" accurate as far as maintaining speed is concerned.

Cheers
I've got the Timeline in house.
On the Lenco, with AC supplied through the Walker Motor Controller, speed set by the KAB with an LP in play, and listening tests suggesting that rhythm and pitch are like real life, the Timeline says my Lenco is a touch fast. I will need another day to determine whether it is "regularly" fast (the error increases in a linear fashion with each revolution) or "irregularly" fast (the error is haphazard in magnitude per revolution). The first kind of error can be "fixed", if I care to do so. The second kind indicates that the Lenco is affected by stylus drag. Not so easy to fix. One red herring: the LP is sitting on a Boston Audio Mat1, which is kind of slippery; the LP itself could be sliding due to stylus drag. I hate when that happens. I hate record weights.
Halcro have you tried the timeline with your TT81?
Unfortunately I didn't have the Timeline when I had the TT-81 set-up.
Now it is too much of a hassle to remove the TT-101..... Install the TT-81....and then re-install the TT-81? Sorry :^)
One red herring: the LP is sitting on a Boston Audio Mat1, which is kind of slippery; the LP itself could be sliding due to stylus drag. I hate when that happens. I hate record weights.
Lew.......please remove the mat. Slippage can be a real problem?