A Copernican View of the Turntable System

Dear Halcro,

I always have regarded speed control, especially for the "belt-drive guys", as absolutely crucial. Drive Force, stability and precision are a must for a very good turntable system.This is why I implemented the VPI SDS drive on my two Micro Seikis in a two way fly wheel configuration. And this is why I am using the Dusch Multiconverter DU 937 for steering my EMT R80 also controlling it very precisely with my Strobo-weights.

I do know people listening to records "in a slower mode" than 33, 45 or 78. They enjoy it as a bit smoother sound. I don't know what they enjoy, maybe wow & flutter, instability and a change in sound... so what.

best @ fun only

Dear Henry, you are right .... that's what I am saying.
And - no matter what I will say, I won't convince and I do not want so either.
The three principles of drive we encounter in analog phono playback are all three with merits and flaws.
None is perfect - none provides what physic asks for in stable speed.
As none can provide controlled stable speed without acceleration.
Unless we minimize the platter's mass - which we don't really want .... for obvious reasons.
It is about getting the platter to speed and preventing it from slowing down again.
The job of the drive is in the first only ... only ... to get the platter to the required speed.
Once that speed is obtained, it is about preventing the platter from slowing down.
It can't be about "controlling" the platter.
Every acceleration of the platter will degrade sonic performance due to very tiny flutter.
After starting the spin, once the platter is on the correct speed, the job of the motor/drive is only - IMHO (and very well backed by Newton and the laws of physic in the Einstein-continuum in which we still are (but don't really know for how much longer - given the latest discoveries in astrophysic science ..)) - to prevent the platter from slowing down.
Not to control it.
This leads to the principle of controlled slippage in conjunction with huge inertia which so far has not been applied to analog audio in any correct way ever.
Mostly because it is very expensive to do it right as it requires huge masses, very precise tooling and - if one want's any convenience in terms of getting to speed within a minute - very expensive motors.
I am neither in the BD nor in the DD camp and not in the ID (idler drive) camp either.
These all have their merits - no question about that.
And we will always see one or the other principle being en vogue due to fashion and style.
These 3 will always be what is available to the public.
But non of these is able by nature to provide the last 1% in performance.
By using one of the 3 common principles in tt-design, we always accept that the last "degree of freedom (here: sound w/o flutter)" is not with us.
Cheers,
D.

Deartonearm,

... Amen.

best @ fun only

Dear Daniel, My I deduce from your arguments that those
small AC motors in the LP-12, Thorens, etc., are meant to
keep the platter moving as soon as the right spead is reached? I have two of those motors in my Kuzma Stabi Reference but I always push the platter (8 kgr) to help
the motors to reach the right spead. Not perfect I assume
but to me it make sense. Or should I limit my comments to logic and philosophy?

Regards,

No No Nandric, you are on the right track. Geoch would love it too I assume. He understands a lot about cultural implications and you two might have crossed ways with a better outcome I am pretty sure.

small or not precise motors will not do a good job for our turntables.
I have seen improvements on older Raven motors when exchanged with Pabst drives. In the meantime they have improved. But this is only an example.

I hope you are not sitting in front of your table moving the platter during playback every two minutes... or did I understood something wrong...

best @ fun only