EMT 927 vs. Micro Seiki 5000 or 8000 - different?

Dear Lew, this is not my domain but if we can measure the forces involved (stylus in the groove) then we can design
a platter with such inertia wich should cure the problem.
My observation is that when the platter is on speed there is very litlle force needed to keep the platter in motion.
I also observed that many TT's have platters at around
10 kgr. Not exactly Dertonarms idea about the needed weight
but I somehow think that this is not accidental.

Regards,

Dear Nandric, there is a kind of "weight threshold" which in my experience divides the platters of turntables in the "men" and the "boys" - or the serious and the toys ...... sonic-wise.
All really "good" turntables I have heard in my life (and I have heard most all) did feature a platter weight beyond 30 lbs.
If one wants to use inertia and calculated slippage in turntable design, one will observe that it works better and better with increased weight (= usually more inertia). But besides that the higher mass has a lot of feedback resonance resistance ( by weight - and if clever designed by structural barriers).
Weight in platter is never a mistake - if your drive can handle it/can work with it to the best.
Cheers,
D.

Lewm,

No offence at all, always looking to learn & too old to worry. DD's friends have or have had that I have heard many times are the Goldmund Studio ( with custom power supply ) ( 3 of them ) , Kenwood L07D ( 2 of those ), Technics SP10 mk3 ( 2 of these ). The standard L07 laid bare speed instablility in the goldmund. The SP10 Mk 3 is the best I've heard but there is a grain or "chopped up quality" to the sound that I correctly or incorrectly ascribe to DD - dont wish to start that debate up again - just relaying what I've heard.

Oh yes, I forgot that old canard about hearing the servo at work. I guess some can hear something they don't like from certain direct drive turntables and choose to ascribe it to the servo. None of these devices is perfect. Then too, the early dd efforts might have been faulty in some cases even though working perfectly but due to design flaws. Certainly that might have been said of products lacking a quartz servo feedback mechanism. So I was naive to have inferred that dd tables as a class have flawless speed stability. Sorry for that exaggeration. I myself am not crazy about some of the dd tables that are much loved, like the low end Technics.

I just love my L07D once I installed an EMI/RFI shield under the stainless steel platter mat. Otherwise it had a slightly dulled sound that one might have said was related to servo. The L07D actually has a very novel and modern approach to the use of the servo, relying to a great degree on platter inertia, a la Dertonearm, altho the platter's mass would not suit him. The coreless motor is a big plus for the L07D, IMO. I am just this week finally listening to my SP10 Mk3 in a massive slate and cherry/baltic birch plinth. It gives a very free and open musical sound once resonance is markedly reduced by the plinth plus a mass added to the bearing housing, a la Albert Porter's plinths. Best of all, no fiddling with drive belts.

Lew,
We want pics!