Direct Drive vs. Idler Drive vs. Belt drive

@thuchan 
I am curious to what tonearms you have tried on the Denon DP100.
Could you please enlighten us.

Re Sony XL88D

Chakster

Very interesting, indeed @nandric 

One of the simplest stylus (Elliptical on one of the most exotic cantilever (Diamond, gemstone cantilever) - this is SONY

On the other side is pretty simple Aluminum cantilever with advanced stylus tip such as Refined Contact (on FR-7fz) and PH Semi Line Contact tip (on Miyabi MCA). 

What we have here is an extreme on both ends:

1) better cantilever, but simplest diamond
2) better diamonds, but simplest cantilever 

But both cartridges as LOMC, so we have something in common here. But at the same time we’re comparing apples to oranges, because those cartridges are different and designed by different people with different concept in mind. 

I think people who love to "upgrade" their LOMC with help of some re-tippers could change cantilever on FR or Miyabi, they could also change stylus tip on SONY. 

This is of course nonsense. Developed around 1980 the Sony XL88D had a "super elliptical" stylus profile. It was much sharper and finer profile than any off the shelf elliptical at the time. This is the danger of speculating about what not you know. How do I know - it was mounted on my turntable, spankers new in 1983. The Sony was developed and released just prior to the development and availability of the microridge profile. Great cartridge.

Sony subsequently used the microridge stylus profile on the XL55ProII released in 1984 and a few other cartridges they released from 84 onwards to the early 90's

By the way the diamond cantilever and stylus on the XL88D are cut from one piece - it is not possible to retip as suggested.

This is something I posted in wbf to a gentleman that was against servos in DD TT because he said that he can hear the damage that servos makes to what he listening through a DD turntables ( as the Technics SP10MK3 or Denon DP100 and the like. ) . Could be interesting to think a little about:

""" But things are " critical " for say the least about your " entitled " against servos because the recording LP cutting machines uses DD non-coreless motors as the Technics Sp-02 on the Neumann or the servo controled ( as the Sp-02 ) Parker motor in the Lyrec lathes. In Scully lathes some gentlemans used the MK3 Technics motor. Altivar was other used motor and obviously its own Neumann one and even Denon.

Raul, you miss the obvious.

The Technics SP02 lathe motor was specficially designed to drive the Neumann lathe with the 70lb Neumann flywheel attached.

If you have a low mass platter with direct drive, the speed correction becomes more invasive. With a high mass platter, the inertia and resistance to stylus drag is much higher, and speed correction less invasive.

Furthermore, DC motors have zero torque at constant speed. Torque is only generated when speed change is occurring in a DC motor. Therefore DC driven direct drive turntables are just like digital - only a little bit out all of the time. In your typical lightweight platter/DC DD motor, it is most likely the platter is seldom at the correct speed at a micro level.

Furthermore speed correction with a DC motor can be scoped - it is a saw tooth trapezoidal recovery ( rough in plain language )  compared to an AC motor recovery which is sinusoidal when scoped ( much smoother and more consonant with music ).

By the way, most of the vintage lathes are worm drive.