Turntable speed accuracy

Dear Thuchan, Our German friends are obviously searching for the new or added preconditions which are yet not known.
If they were known and technicaly solvable then probable
there would be no or less problems with those damn TT's.

Regards,

I discovered that removing one of the three motors of the Raven AC-3 (aka Raven AC-2)......the turntable was able to maintain far more accurate speed control than with the three motors.
Perhaps the belt stretch or slippage is increased with the three motors?......or the greater contact of the belt on the platter with two motors is the reason?
I can't wait to try a Bavarian thread in place of the rubber belt?
Are you listening D? :^)

I am listening (... reading ...), Halcro ...;-) ...
Just back from California and Texas and haunted by 9 hours jet-lag.
Will get the "secret rope" off to you on friday.
Sometimes less is more.....

Dertonearm
If speed accuracy has nothing to do with sound performance but is a seriuos basic request with a design then where would you as a designer place it in order of importance if all else is managed in a design of a turntable?

In other words if the motor/s, speed controller, belt/s are not up to the job holding the speed when a record is being played would this not drastically effect what you hear?

In_shore, sure - speed accuracy does heavily influence sound quality.
However IMHO speed accuracy is a basic - if not THE basic - request to ANY turntable.
As said before - this is a conditio sine qua non for any turntable.
As this is a basic feature, it is not contributing to the sound quality, but only in negative sense - i.e. if not accurate speed.
So - here it starts, it is not a goal but the mere basic request which has to be meet by nature anyway.
I as a designer simply make sure this demand is meet to the utmost possible as the very first step.
And I for one think this is easy given today's technical tools and options.
Accurate speed can be obtained with idler wheel, direct drive or thread drive.
It can be achieved with belt drive too, but only with much more effort in control.