Yes, both frequency and voltage are adjustable. It’s really not suitable for DC motors.
My comment assumed that OP’s table had a ac synchronous motor. If the motor is a dc, then your statement is correct.
Precision Motor Controller
Hi my Fellow Audiogoners,
I have Micro Seiki 1500VG with a outboard power supply/motor. I'm sure most of you know what my 'table looks like. My question is can I hook up something like a Walker or VPI precsion motor contoller. Would I just hook up the precision controller before the motor unit? Does it override the 33/45 controls on my MIcro. Has anybody, by chance, done that to their MS? The reason I'm not interested in changing out the motor is the unit also controls the vacuum hold down, and I just had that, amazingly, fixed. So I don't want to sacrifice that aspect of the Micro. It's amazing how the sound is improved by having a perfectly flat reecord for the arm/cartridge to traverse.
Thanks,for reading this and should you have any answers, talk to me!