Thanks for your further response. You have clearly been in this a lot deeper than I.
I am really lucky (deaf?) because I get no surface noise issues with my playback once I have cleaned the records that need it on my Nitty Gritty.
The reason for posting again is your mention of the US Library of Congress. You will probably know that Simon Yorke supplied transcriptor players to the US Library of Congress that were used to make digital copies of a large number of analogue discs of all sorts of dimensions and specifications.
I came across Simon in his earlier years in County Durham, NE England. I had acquired an S2 Zarathustra that is a truly rare hi-mass sprung turntable. Simon says he made less then ten. I visited him in the late 1980s to acquire some spares for that and to audition his S7 with unipivot arm. I bought that. As you will know, it was Michael Fremer's reference player for some eight years before he travelled way upmarket, boosted by discounts available. It was a very good player, miles ahead of his S2 that in turn was miles ahead of my early Linn that it replaced. The unipivot arm was said to be the S7's weak point but I never moved to replace it.
Simon had become a friend and he spoke over a long period of his development of a parallel tracking arm. He let me know when he had it in production and I visited him, now in Spain, for a few days to chew the fat, enjoy the local Spanish cuisine and beverages and audition his S10, a development of the S7 and, most importantly, the Aeroarm.
Well, if you have never heard it, this combination is wonderful as long as you choose a lightweight high compliance cartridge. Matches made in heaven are Ortofon A90, 95 and now Verismo. It is also very good with van den Huls and the AT1000
This truly is a world class player and far less costly than the blingy $000,000 heavyweights that purport to populate the high end of the market today.
Simon is a really nice guy but over the years his negative marketing traits have not been kind to his business. So I was lucky to get in on the ground floor with Aeroarm #003 the first customer piece. There are only a handful of customer Aeroarms and will be no more. Simon is out of the business now but we keep in touch from time to time.