Up to series III the Sotas used the papst pancake dc motor (different to the external rotor papst as used by empire etc) and I think a well regulated dc supply with anywhere from 24-27vdc should be fine. I don't think the motor draws a lot of current as we did some tests when I wanted to modify mine and even loaded to the point of stalling the motor and if I recall correctly(it was quite a few years ago) the current draw was less than 50ma.
I ended up using the motor, platter/bearing and vacuum pump for a diy Frankensota that I still use (I do have a couple of diy direct drive tt's brewing however). For the power supply, I used 5x6v SLA batteries in series followed by a shunt regulator circuit built by a friend of mine and retained the original raw dc (pre regulation) supply for charging the batteries..... worked pretty well as you could usually go a couple of weeks between charges.
I ended up using the motor, platter/bearing and vacuum pump for a diy Frankensota that I still use (I do have a couple of diy direct drive tt's brewing however). For the power supply, I used 5x6v SLA batteries in series followed by a shunt regulator circuit built by a friend of mine and retained the original raw dc (pre regulation) supply for charging the batteries..... worked pretty well as you could usually go a couple of weeks between charges.