Direct drive vs belt vs rim vs idler arm

"So, Richard, are you inferring that the GP Monaco claims for the speed of their speed correction system are not so earth-shattering or envelope-pushing as one was led to believe, given what Goldmund did two decades earlier?"

Goldmund didn't do it at all! They just sourced the motor and electronics....first from Papst then from JVC when the Papst motor was discontinued. Their claim to fame was the use of methacrylate and in the energy transfer path to drain away vibrations... I do the pink Triangle predated their use of acrylic (and maybe Merrill as well).
IMHO neither Goldmund nor Monaco would have the resources to pull off a dd system in the way one of the Japanese giants would have back in vinyl's heyday.

Dover.
Are we not getting off topic here? My reasons for dropping the Goldmund motor as a mule for my TT project will in no way advance this thread. It is an average motor with an above average speed measuring mechanism. Further you have described how it works. I only used it by way of example to back up my earlier assertion that high sample rates were used way back then. You are quite right, the sample rate and feedback loop bandwidth of two different things. It is probable that the samples are put thru several divider networks to bring the sample frequency down to a manageable level while simultaenously improving accuracy. (Other TT's of that era do this). I no longer have a circuit diagram so cannot confirm.
And yes, wavy lines on a PCB under a multi pole rotating magnet are one way of measuring speed. Their output count is exactly as I described. Still used today in our industry for their robustness and long term reliability.

02-11-13: Richardkrebs
Dover.
Are we not getting off topic here?

No. Read the name of the thread.

Dear Lewm,
yes, the 5 way horns changed a lot and improved the listening quality. In the last days I was frequently asked why I am offering my Micro SX 8000 II, my love baby - by which my real passion with analogue audio started. It is very simple: I am running out of space in "my small room". It is not a matter of drive technology at all. I have three big TTs left, two are belt driven ones, one is another SX 8000.

When you are following the discussion about the TechDas, also a belt driven concept, one might get the impression that regarding the price there are three times more people getting a stake than it used to be some 25 years ago when the original design entered the audio world.

Lespier/ Mosin
Yes it must be very expensive to cover the R&D plus tooling for a complety new TT and motor.
Mosin, perhaps you can give us some insight on this, from within the industry, when developing your spectacular TTs? Not DD I know but it would be informative to hear any comments you are prepared to share with us.
Thanks