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Direct drive/rim drive/idler drive vs. belt drive?

O.K. here is one for all the physics majors and engineers.

Does a high mass platter being belt driven offer the same steady inertia/speed as a direct drive or idler drive?
Is the lack of torque in the belt drive motor compensated for by the high mass platter. Object in motion stays in motion etc. Or are there other factors to take into consideration?
I am considering building up a Garrard 301 or Technics SP10, but is it all nonsense about the advantage of torque.
I am aware that the plinths on these tables can make a huge difference, I've got that covered.
My other options would be SME20 or Basis 2500 of Kuzma Stogi Reference etc.
If I have misstated some technical word, please avert your eyes. I don't want a lecture on semantics, I think everyone knows what I mean.
Thanks in advance.
mrmatt
jb0194
476 posts
 
Ralph,

Have you tried "record periphery rings"? It would appear to benefit warped lps, of which I have a number.

Your feedback would help me in considering same. I've already tweaked the mat and use a spindle weight. My table is a Dual 721 with robust DD motor. FWIW, speed has been rock steady (by strobe) with the 4 or so extra pounds added by "steel/polymer/steel sandwich + carbon fiber donut" platter mat and TTweights heavyweight brass spindle weight.
atmasphere's avatar
atmasphere
7,068 posts
 
Axel, I regard differences in dynamics as a coloration, just like tonality and soundstage. All are **definitely** aspects of platter pad vinyl resonance control (or lack thereof).
atmasphere's avatar
atmasphere
7,068 posts
 
Jb0194, I think they have advantages if your system will allow them, in controlling warp. Since the platter pad controls the LP's resonance signature, the ring won't do much to help- it will merely insure that the coloration is consistent across the entire surface.
quiddity
119 posts
 

Dan

It would be giving something away, but you are on the right track. It's the design of the filter that takes all the time and effort in the Spice model.

Matt:

Q 1 Asked and answered.

Q 2 No.

Q 3 No.

Mark Kelly
lewm
6,770 posts
 
Jb0194, The fact that your turntable still runs at the correct average speed after you added all that mass, especially a heavy periphery ring, is not proof that there is no deleterious effect. But I don't think the Dual has a servo mechanism at all to worry about, and I believe it's an idler type in the first place, not a DD. You would of course know better than I about that. My remark was strictly with regard to servo-controlled DD tables. Moreover, if it sounds better to you with the added gadgets, that's the bottom line.
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