From my understanding of the Goldmund Studio situation is that...
1) If you have nonworking motor, you need to replace it with...
____A) Stock Papst motor, if you can find one.
____B) Stock JVC motor, if you can find one.
____C) EDS-1000 motor salvaged from Dual CS-701 turntable.
____D) EDS-1000-2 motor salvaged from Dual CD-721 turntable.
2) Read quote from below:
"Dual 701/721, EDS 1000/EDS 1000-II- These motors are 5.5" in diameter, while the original Goldmund Papst is 4 3/8", so machining is required....... Further, both motors are fed via their own electronics, and MUST be used with it. It is not bulky, will fit inside. All in all, I would only recommend these if all other options are exhausted"
Personally I would prefer the 701 motor for this purpose because it was designed for a heavier platter (2.9kg) as the 721 uses a lighter platter (1.5 kg) and has less torque. Go for the 701, I say. All the electronics are underneath the motor and the power supply is in its own enclosure so that can be outboard from the table. There is an umbilical cord for the 33/45 speed switch and two pots for speed adjustment. You can eliminate the strobe light if you want.
Again, the person who did the conversion emphasize that he would "only recommend these if all other options are exhausted."
You have been warned. :)
P.S. Or you can simply buy a beater 701 and take out the motor and electronics and make a simple plinth for it and have a listen like
this guy.
_______