TECHNICS SP10 MK3 POWER SOURCE / SPEED CONTROLLER

Lew
Glad that you are enjoying my upgrade.

Re a controller for the SP10 MK3
The motor unit has all of the infrastructure in place. Commutation and speed sensors.
There are a number of quality industrial PMSM controllers that could likely work well. They are expensive and can be a time consuming pig to program. Thus one would need deep pockets indeed to go down this road.

Gentle people.
I have, had a controller with the voltage selector. 
I bypassed the selector which was a worthwhile improvement. But obviously, do this at your own risk and put a clear warning note on the rotary switch showing that it is no longer active.
The service manual shows the required wiring to set up the transformer to the local voltage.
You also need to consider the effect this change would have on the value of the unit once done. 
That said, it could be reversed if you decide to sell at a later date.

cheers.