Direct Drive vs. Idler Drive vs. Belt drive


I'd like to know your thoughts on the strengths and weaknesses of each drive system. I can see that direct drive is more in vogue over the last few years but is it superior to the other drive systems? I've had first-hand experiences with two out of the three drive systems but looking to learn more.
128x128scar972
Thanks, Ralph.  That's a very key point about direct drive (the absence of a force in the horizontal plane that pulls the spindle shaft up against the bearing wall) that the belt-ers choose to ignore.
Yes, this is an advantage of a DD drive that is often overlooked. There is no horizontal force induced by a belt, thread, tape or idler wheel.

There is a toppling force if the thrust point is at the bottom of the bearing but this should be easily absorbed by a properly designed bearing. 
Invert the bearing with the rotating mass centre of gravity at the pivot and this force goes away as well. 

There is then the obsession with micro polished shafts. It might look great but technically it is sub optimal in an oil lubricated bearing. We want to maintain a continuous thin oil film. This is best achieved by a microscopically dull shaft surface finish which captures the oil film. Built properly a bearing like this has only the thrust pad as a contact point. Since this point has an extremely low radial velocity due to the small contact area, it can be made to be very quiet. Any noise in the bearing shaft/sleeve area is the shearing of the oil itself.  

cheers.  
In belt drive, you need to have everything ideal, otherwise the speed is floating.
A freqsion of needle, and bearing decrease the speed,  the motor doesn't control the platter but tries to hold a speed constant and it makes a belt tension change and speed oscillation.
Every small change of belt tension, material, width change sound dramatically.
Bass has rubber, soft sound, PRAT is broken. For classical music, especially piano music or fine rhythm jazz belt drive completely kills rhythm details and changes music for unconnected set of sounds. 


I respect all drives and am adamant they all have there strength and weaknesses. All have the ability to play quietly and appeal to the INDIVIDUAL'S preferences of what THEY believe is right for them. All of you that are biased closed minded to ownership not only ignore strengths , popularity, but embellish all faults of each in a general broad attacks not serving the truth to the improvements specific brand and model have.
Many inverted quality bearings in design and applied with a weighted platter show zero horizontal pull much less rubbing the spindle. General statements of ignorance not fact are common with all biased ownership rants. There were and are are an awful lot of horrible DD tables made not just the very very few better ones. Something few of you immerse in the generalized opinions paraded as facts.
Same as many belted units are sub par but far from all and idlers do indeed have a need of massaging out self noise. 

The final sound followed by users visual appeal is all that's important. Not what one or two gregarious opiners of one drive think here. Like when specs are brought up and championed, yet the fudging of how those numbers were done in Japan, a well known fact is left out. (Weighted )

Vinyl is a great medium for those that appreciate it and what it can bring to music. Bashing users like Rega owners who like the prat and prefer simpler less fussy of plug and play is childish. It would seem to me, inclusiveness would be a better way to respect choices and to learn. Being that guy that can only praise what he owns and shade anything or anyone else that doesn't fit their narrow view and generalized ignorance is killing interest and the participation in these forums.

It's not a simplistic obvious fact which is better. Its a choice in preference of appeal to tone and timbre, degree of difficulty and ability and willingness to achieve it ......and like it or not estetics are a key to most for appeal as part of the draw. I find it amazing what some have done and produced in all drives to better the playback and reduce drawbacks. The negative biased drivel of anything other than what one narrow mind owns here. ...not so much. Enjoy the music, respect the individual and his choice....after all. ..its opinion in the end..