Dover, I'm referring to the later model called Parthenon 2025 on my old website that you linked to. You have a very rare beast there, I heard them a couple of times on my trips to Japan but never owned one. My friend had the SZ-1 and the American Sound to play next to the Parthenon.
It is sonically different from MS but its not only the motor, there are very many other differences. The materials are different, inverted bearing vs air bearing. The tone arm base setup, then there's the weight ratio between between base and platter which can also alter the sound. There probably are other less obvious design differences between the two. The later Parthenon 2025 wasn't bad sounding but used various gimmicks to try to achieve the same level as the original, the just didn't get far enough with it.
david
PS it's interesting that now twice in this thread people referred to our rooms at the shows as Lamm rooms, obviously I failed the marketing test!