The early Goldmund Studio/Studietto used a Papst motor.
The later Studio/Studietto uses a JVC DD motor.
The tonearm is a dog - you would be better off replacing it with a pivoted arm - much less hassle.
Goldmund Studietto repairs
Bought mine in 1986. Not used in years as tracking arm stopped working. Now want to repair. Need a specialty repair/refurb shop. Thanks for suggestions. I'm in Vancouver, BC but won't hesitate to ship. Cheers to record lovers. ( I have a Spectral Cartridge. Will it need refurb?)