Teres turntable motor problems

Custom pulley should not be terribly costly. Why not ask them for a source? If they can’t do it, they may know someone who can. Or, assuming the existing pulley needs to be greater in diameter, maybe its diameter can be increased by wrapping it. Also maybe Bill Carlin(?) of Phoenix Eng can fiddle with the electronics to make it work. Sounds like all you’d need there is a different potentiometer. Bill is a nice guy.

Not sure why you are giving up on your present motor unless you found out fixing it was prohibitively expensive, but the gains associated with tight speed control afforded by the SOTA Eclipse system are not trivial. In other words you’re not just getting a new motor. Whereas a used VPI also “needs” the Eclipse.

In the Phoenix Engineering set-up, the sensor is set in a fixed position under the outer edge of the circle described on the surface of the plinth by the platter floating above it. Then a magnet is fixed to the underside of the platter, at its outermost edge, such that the two elements pass over each other with each complete rotation of the platter, with a certain max tolerance for the distance between them when they are momentarily superimposed. Every time the two elements are in proximity, a signal is sent to the Roadrunner (tachometer), where the speed of the platter is compared to a reference (33.333 or 45.000, depending on the setting). If the Roadrunner perceives the platter is moving a hair too slow, it sends out a signal to the voltage source (I forget the Phoenix Eng names for that device; they made two versions with different wattage ratings, so the original PE system is compatible with a wide variety of AC synch motors), which pulses the motor to speed up if that is needed. Or the motor reduces the drive force, to slow down the platter. The Roadrunner is not just monitoring speed; it is actively maintaining an exact set speed via its role in feedback to the driving amplifier. I hope this answers your question. In the Sota system, the driver amplifier is designed specifically to work with their Eclipse motor that is included in the Eclipse package.

I am using the antecedent Phoenix Engineering system, which is the Eclipse minus the motor, on my Lenco, very happily, as are many others. The only concern would be whether you can fit the Hall sensor that monitors platter speed, in between the bottom of your platter and the underlying plinth. SOTA can probably tell you how much space you need. 

Good idea to work with Thom at Galibier. I also wonder whether you could adapt the SOTA Eclipse motor system to the Teres. But it’s always easy to suggest a costly remedy for what might be a problem with an inexpensive solution.