2008 RMAF – – – all things analog.

yet there is no drive system that will remove our drag problem that i am aware of.

hummmmmm.

as far as stylus drag/groove modulation.....i think that the Rockport Sirius III's drive system may solve this issue. you have an pure induction direct drive motor with zero torque ripple, a 55 pound platter, an air bearing, and a servo system (coaxially mounted optical encoder) which samples the speed every .000001 of a second.

the only support i have for my opinion besides the design description is the unique way that the Rockport handles musical peaks to my ears. until one hears it on a familiar Lp it's easy to dismiss the signficance of it.

a side note on the servo; when it is engaged a green LED flashes to red. the servo is never engaged unless the 'floating 250 pound plinth' is bumped or if someone jumps up and down on the floor in front of the tt. once the platter reaches speed it stays there. there is no hunting occuring. stylus drag does not cause the servo to engage on the Sirius III that i have observed. maybe the servo engages without the LED flashing, but i don't think it works that way.

i have a Technics SP-10 Mk2 sitting next to the Rockport which does a very good job on this issue.....but not at the Sirius III level of naturalness and continuousness. of course; there are more differences between the SP-10 and the Sirius besides stylus drag to cause these differences.

there may be other tt's which are able to do this same (stylus drag/continuousness) thing equal or better but i've not heard that.

anyway; stylus drag can be solved.....but it's not easy to do.

Great post Mike. Is there another turntable that might match the Rockport? I don't know but this is an interesting proposition.

Imagine for a moment a turntable with 1.1 tons per CM2 moment of inertia, driving a copper laminated platter that weighs 10KG and starts in 0.25 of a second.

Imagine this same turntable has the second lowest rumble (noise) ever measured in ANY turntable, figures of 98A via (DIN 45 507) and exhibited speed variation of zero (unmeasurable) up to applied forces of 10 KG per CM.

The force required to cause error is the equivalent of 1000 tonearms, all tracking at 2g each. Speed error remains +/- 0.001% and wow and flutter is 0.015% WRMS.

Pretty amazing for a turntable that's now 20 years (+) old. Unfortunately they sell used for $6000.00 and up to $10,000.00 in new condition.

It's the Technics SP10 MK3

Albert,

thanks. and i'm excited to read about the technical merits of the Mk3 drive system. it's all your fault i've dived into these vintage dd tt's.

i'll be shipping my Technics SP-10 Mk3 to Dobbins on Monday so he can work his magic with it. then we'll see how it compares to the Rockport and the Mk2.

are you listening to your Mk3 yet?

Dear friends: I like Mike, Robdoorak, Albert and some others think that the stylus drag exist but does not means that a Rockport/SP-10/Walker/Verdier/Micro Seiki/Garrad/etc/etc change its speed stability due to a VTF of 1.5grs and if it did/ do there is no single proof that can tell you that what you are hearing is due to that change in speed on the platter TT due to the stylus drag.

I know that our ears are very sensible not only to minute speed platter changes but how ay one ( like Doug ) can affirm that can hear it and that it is for the stylus drag, how Doug can separate those minutes speed changes due to stylus drag from other sources about, Doug IMHO if you are hearing that maybe someting wrong with your Teres and if you are hearing in other TTs maybe a bad set up, you say that what Robdoorack posted say nothing and IMHO what you think you are hearing say nothing about till you can prove it in an objective way.

Again in this very complex subject IMHO we need a scientific measures ( first we have to " create " a methodology of the measurements to be precise how/where/wich we have to take the test. We have to be precise with which kind of record modulation, at inner of the platter? or at the middle of it?. It is really complex even to have the right measures methodology/estrategy. ) about with 3-4 different TT where the TT/tonearm ( whic one ( s )/cartridge ( which cartridge ( s )/platform be perfect or near perfect, till we have it and prove that we can hear it for sure ( speed changes due to stylus drag. ) I think that it is useless to discuss about.

Doug, I always think that you are a wise man: I wonder why you insist on this extremely complex subject where you can't prove it!, maybe I'm missing something because I can't understand your whole attitude about.

regards and enjoy the music.
Raul.

No MK3 yet, but the platform for it to sit on is supposed to be delivered tomorrow. Hopefully the plinth is no more than another week after that.

Dobbins says the MK3 is better than the MK2, I don't know how much better but assume he's right, he's very conservative with opinions.

A crazy thing just happened, suggest you contact Louis or any member of my group for confirmation. I already told Dobbins and he is supposed to do a test.

I replaced all the fuses in the MK2 and MK3 power supplies (10 fuses total) with the Hi Fi tuning from Cable Company. Everyone in my group raved about the difference all last Tuesday evening. (Listening to MK2 only of course).

Power supply always seems to be a big deal, and this one has already had all the caps replaced with Black Gates and Nishicon's, the stock cord cut and replaced with high quality IEC male. The AC cord is now a Purist Audio Anniversary and the internal supply wire was replaced with Purist 12 gauge conductors.

Who would think 5 fuses would be so audible when all those other upgrades are already in place? Or maybe that's why they are so easy to hear, everything in the chain seems to be a big deal and the more you peel the onion the more is revealed.

I can hardly wait to hear how the MK3 performs, especially since it will be fitted with the Air Tight Supreme. I'm very seriously considering the Koetsu Coral for my MK2, to replace the Air Tight PC-1.

That way I would have the best of Koetsu and best of Air Tight. Could be very cool take on the music from two excellent sources.