Direct drive vs belt vs rim vs idler arm

Dear Dover, You are probably correct, and the discrepancy is probably one of semantic nature. Maybe the Goldmund spec is "per minute", for example. That would make the GP Monaco much faster than the Goldmund, which we agree it should be.

But I do take the point, which I myself realized after posting, that the term ultrasonic must mean that the correction rate exceeds the highest frequency of what we deem to be the audio spectrum, 20kHz.

As to servo or no servo in the NVS, I went to their website, Dover, after you quoted from it. In fact, I do not see the word "servo" anywhere. Did I miss it?

Have just pulled apart an old Goldmund motor I have lying around.
I am impressed all over again with its speed sensing design.

It has 164 slotts and 176 magnetic poles ( north plus south) in the speed sensor assembly, per revolution.

This gives 14,432 counts if they only consider, say, north pluses and 28,864 if they use both north and south. My memory was a little out. Apologies

Didn't Goldmund use the JVC/Victor motors?

Richardkrebs -
Is this the Papst or JVC motor ? Can you explain how the speed sensor works in the Goldmund Studio.

Halcro
Yes it is a JVC motor. After I sold my Goldmund, I had plans to build a TT based around this motor. It was an easy purchase from JVC in Japan, at the time. The project was shelved after further research on motors.