Belt Drive Turntables/Record Players with 2- or 3-Pulley drive System - Overview wanted

[tiefbassuebertr]

By accident I discover on the web this 3-pulley belt drive turntable - a good approach to avoid a general disadvantage of belt drive turntables:

Funk Vector Link Turntable:
https://www.enjoythemusic.com/superioraudio/equipment/0808/funk_vector_link.htm
under
https://web.archive.org/web/20080216232158/http://www.thefunkfirm.co.uk/V_Link.htm
I read this:
The VECTOR is the ultimate solution to the problem of motor pull. It is a 3-pullley drive system that is fed by an ironless rotor (low mass to you and me) DC motor that is mounted on the sub-chassis with the belt tension force then distributed about the sub-platter via 2 passively driven slave pulleys. These patented innovations are unique to Funk.

A similar approach was realized by an other brand which I have seen several years ago (maybe VPI industries - but I am not sure) - but the slave pulleys at this belt drive device are located outside from the platter.

check out more images (Linn SONDEK LP-12 mod to a 3-pulley drive system) in post 160 under
https://www.diyaudio.com/community/threads/linn-sondek-diy-mods-that-work.272570/page-8

more URLs:
https://www.hifinext.com/acoustic-signature-unveils-new-generation-of-neo-turntables/
https://www.stereophile.com/content/acoustic-signature-montana-neo-turntable
https://www.acoustic-signature.com/products/turntables/invictus-neo/

Thank you for calling more turntable brands/models with a three pulley belt drive system.

P.S.: from this approaches I'm less convinced because the pulleys aren't surrounded (distributed around the platter):
https://www.music-hall-shop.de/produkt/music-hall-mmf-11-3-plattenspieler/
https://www.stereophile.com/content...venger-reference-turntable-vpi-fatboy-tonearm
https://www.stereophile.com/content...n-acoustics-codia-acoustic-design-stein-music (fourth picture)
https://www.analogplanet.com/content/tw-acustic-introduces-triple-motor-module-raven-ac-turntable
https://www.pressreader.com/germany/stereoplay/20191004/281651076833538
even not from this approach:
https://www.diyaudio.com/community/threads/idler-wheel-magic.214019/

 

[DNic]

Hi, It's all about trying to overcome the stretch and slack of of the belt system. So here it will happen 3 times, but to a much lesser exstent than on a conventual system.
I prefer using a known none or shall we say greatly reduced belt stretch of Mylar tape to drive the outer perimeter of my T/T. There are many means to an end.

Cheers

 

[tiefbassuebertr]

check out post #161+162 under
https://www.diyaudio.com/community/threads/linn-sondek-diy-mods-that-work.272570/page-9
for an diy example of this approach

 

[tiefbassuebertr]

Hi, It's all about trying to overcome the stretch and slack of of the belt system. So here it will happen 3 times, but to a much lesser exstent than on a conventual system.
I prefer using a known none or shall we say greatly reduced belt stretch of Mylar tape to drive the outer perimeter of my T/T. There are many means to an end.

Cheers

Because most belt drive work only with one motorpulley and rubber belts for me the most important question is as follow:
What is the correct value for the pretensioning force resp. stretch factor of belts of various compliances (right contact pressure on motor pulley and platter)?
check out this thread:
https://www.diyaudio.com/community/...-belt-drive-turntable-and-replacement.390372/

 

[DNic]

Yes you are correct, I overcome this by varying the overall weight of my motor pod, then measuring the speed with an app. So much tension on the belt & the speed is adversely affected. Notice the back foot does not touch the Pod block