Direct drive vs belt vs rim vs idler arm

Dear Richardkrebs: I agree with Jazdoc too. There are several targets on a whole TT design and certainly what you posted:

+++++ " have absolute speed stability under all load conditions. " +++++

is a primary one but is only one link/part of the TT design and execution design. As you said: TT bearing is critical, platter weight and motor match, arm board design, platter build materials, plinth build materials, arm board build materials, mat ( if any ) build materials, drive system, motor choosed, TT footers, damping/drain vibrations/resonances, etc, etc.

Good to read your posts and other people ones that in many ways what we read it in this tread ( at least for me ) was/is a learning one.

Regards and enjoy the music,
R.

and we have to remember that that ideal/perfect TT design main target is to: FULFIL THE LP/CARTRIDGE NEEDS and not only to take money for we the customers.

R.

Halcro, your video of the Victor is most impressive. I'm not sure that many tables would pass that test which such flying colors. Well done. Have you tried this test with the dot falling on a wall that is further away? The video of the Transrotor tells a whole different story. It's surprising how far off that is with such a heavy platter. Someone once described the effect of stylus drag as similar to a fly trying to slow down an elephant. I no longer see the relevance of that analogy.

As interesting as a list of tables that pass this test would be, I don't think we will see one any time soon. Thanks for sharing your video.

Thank you Peter,
When I saw that Timeline video using the Transrotor turntable.......it was also the first time that I was able to appreciate the effects of stylus drag.
It's hard to imagine anyone claiming that 'speed control' was inconsequential after viewing it?
Regards

Richardkrebs,

very informative, thanks for taking the time to post.

I have learned first hand that specific tables I have either owned and/or have listened to don't meet even your number 1), not sure about the other two.

I do like what you wrote that tables need to;

1) have absolute speed stability under all load conditions.
2) have absolute dimensional stability between platter and arm support.
3) be absolutely still, with total immunity from external movement.

Can you or anyone else please provide a list of tables that actually meet and pass these requirements