I have an older GYRO SE with the german Papst AC motor. I think this motor itself is very good and deserves the best controller/PSU available.
I did use the Gyro with the Clearaudio Syncro, works fine but this only generates a single phase output, so it still needs a capacitor to create the correct (90-deg) phase shift. Still not optimal ...
No I use it with a real 2-phase generator where you can adjust the following: output voltage, frequency for 33.3 rpm, frequency for 45 rpm, phase shift (between 0-180deg) and startup speed.
It's a bit like the QC but with more flexibility. Frontside:
I used aluminium cases from Conrad. They're very easy to work with, look a bit industrial but I like that.
They're not so big so I used one for the toroid (lowest) and one for the PCB (top). Backside: Interior:Practice:
After setting the output voltage at 18VAC my Gyro spins like a dream. The German Papst motor runs very smooth and quiet while staying cool.
A phase shift of exactly 90-deg gives best result, but this is no surprise, knowing these German motors are very well made and accurate.