Turntable speed accuracy

Ketchup: "You would think that at least one of them was an audiophile today and maybe even posts on an audiophile forum, but I have never seen one of their posts."

There may well be, but I doubt very much they would post on an English speaking forum. Japanese? ...maybe!

"You would not use a Pabst motor in a direct-drive turntable"

Lewm
Pabst is a company that made many motors. The external rotor one used in the Empire(Atmaspere)turntables is merely one of their products.
They made dd motors for Revox and Goldmund and I I believe they also had something to do with the Dual eds motors.
The external rotor one was used as an upgrade for the TD 124 and the also made a dc motor for belt drive that was used in the early SOTAs.

I meant to say that Thorens offered an external rotor papst 3 phase motor as a replacement after they stopped making the original induction motor for the TD124. The jury's out on whether or not it constitutes an upgrade.....consensus on an audioasylum thread was that the original motor was preferred. I suspect it's because the papst 3 phase doesn't like being slowed down by the eddy current brake. With a proper 3 phase variable frequency power supply and setting the eddy brake to minimum I think the situation could well be quite different.
Lewm, your (and other's) journey of discovery with respect to direct drives & lencos is inspiring me to take the plunge and go down that path.
I'm planning a diy using the dual eds 1000 motor and I also have a Lenco GL78 I want to play with.
I'd also love to get my hands on a Denon DP80 or 75 .

Hi Lewm. Papst made a huge variety of motors. I think the company still exists and now makes industrial fans. I haven't seen the external rotor type being implemented for dd nor do I think it would be a good idea to try. They did make a number of dedicated dd motors though . The SOTA turntables (as well as many other brands in the 80's & 90's) used a papst dc 'pancake' motor up to series iii . I did have a star iii as well and now now use the platter, bearing and vacuum pump in a DIY tt but with a different motor.

Hi Lewm. Papst made a huge variety of motors. I think the company still exists and now makes industrial fans. I haven't seen the external rotor type being implemented for dd nor do I think it would be a good idea to try. They did make a number of dedicated dd motors though . The SOTA turntables (as well as many other brands in the 80's & 90's) used a papst dc 'pancake' motor up to series iii . I did have a star iii as well and now now use the platter, bearing and vacuum pump in a DIY tt but with a different motor.

Glad to see this thread revived.
I too was dissapointed when the NVS thread was pulled but here 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.

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.

Lewm
Do you think that adding mass to the platter of an existing dd turntable( assuming the spindle bearing is up to the task) could also achieve the same effect as "loosening" the servo response.
Perhaps the periphery clamp of the LO7D helps to achieve this.