The VPI SDS motor control is one of the finest and most helpful motor steerings for turntables. Unfortunately it is not built anymore. I do use two motors with two control units. To balance the pulling force of both sides I usually assess the vectors by a simple method.
AudioCirc.com 
The best future of this posting is the tension meter that if you back it up with a tentelometer you have a nice set of tools to service your tape machines and keep happy the tape heads and your tapes.
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The turntable driven here is a especially built heavy steel platter combined with a SDP top platter thus allowing no direct connection with the originally designed Micro Seiki spindle and the excellent hard belts. Everyone who has experienced a design like this one knows about the excellence it provides for the sound.
The VPI motor controllers add to the accuracy of the speed.
I know others prefer direct drive and rim drive which I like very much too. This kind of belt drive is exceptional and absolutely precise. The sound is straight and overwhelming.
Best
E.
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E.,
So do you,use the VPI units in addition to the Caeles’ own motor controls, or do the VPI units replace them?
I recall once seeing someone using a VPI outboard ‘RIM’or idler drive unit that pressed up against the platter along with a VPI Belt drive unit to create a ‘push/pull’ system. It worked but was very difficult to setup properly.
Can you hear a difference using the two motors over just one? I’m curious about this as I have seen several tables now using two and even three motor units..
N.
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N.,
The Caeles is now driven by two Sperling motors, the SDP Micro table -shown here- is driven by the two VPI motors. Two motors is the best you can do for your table but you have to adjust them properly.
Best
E.
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