Dear Dover, There you go again. Trying to "prove" that one drive system is "better" than another (or in this case, "worse") by arguing from first principles. First, I think there are a lot of holes in your arguments, and second, have we, or at least most of us, not agreed that execution is paramount? That each drive system has its failings?
By now I get it; you don't like direct-drive. You do like your Final Audio TT. Live and let live.
On terminology: Motor "slip" is a term I have only read in connection with induction motors. They must slip in order to generate torque. This would apply only to idlers, as the older idlers are the only TT's I know of that used induction type motors. Induction motor combined with eddy current or other type of "braking" can make for excellent speed stability. Also, "jitter" has a specific meaning in terms of digital to analog conversion. Let's not confuse matters further by using it to describe a phenomenon related to what? Cogging or servo correction? These two phenomena are entirely separate and independent of one another, and yet they are being lumped.
FWIW, The top end Denon DD's used 3-phase AC synchronous motors. The top end Technics DD's use what you would call DC motors. But Bill Thalmann told me in conversation that if you look at the actual circuit of the Technics, the distinction between the two is not so great. DC motors are used in some of the most expensive BD turntables, as well, and the manufacturer's tout the fact.
By now I get it; you don't like direct-drive. You do like your Final Audio TT. Live and let live.
On terminology: Motor "slip" is a term I have only read in connection with induction motors. They must slip in order to generate torque. This would apply only to idlers, as the older idlers are the only TT's I know of that used induction type motors. Induction motor combined with eddy current or other type of "braking" can make for excellent speed stability. Also, "jitter" has a specific meaning in terms of digital to analog conversion. Let's not confuse matters further by using it to describe a phenomenon related to what? Cogging or servo correction? These two phenomena are entirely separate and independent of one another, and yet they are being lumped.
FWIW, The top end Denon DD's used 3-phase AC synchronous motors. The top end Technics DD's use what you would call DC motors. But Bill Thalmann told me in conversation that if you look at the actual circuit of the Technics, the distinction between the two is not so great. DC motors are used in some of the most expensive BD turntables, as well, and the manufacturer's tout the fact.