@rauliruegas
Btw, have you interest to buy a SAEC tonearm?
I have no intention to buy new 8k tonearm from any manufacturer, i like my Reed 3p "12 tonearm, it's new design, not a 30 years. But i like vintage tonearms as well, regarding vintage tonearms i'm not gonna pay more than 1,5k for any of them. I've learned from many audiogon threads that SAEC with its knife-edge bearings is not the best tonearm. And that's why i asked again is that good or not? Just curiosity, i'm not gonna buy Saec anyway.
Sadly @dertonarm is not posting anymore on audiogon, so i can not speak for him about his calculations etc. What i think is that size of the record does matter, especially for professional tonearms, if it was made for radio stations then the main format for new material on vinyl is SINGLES or "7 size first, all promo material for the radiostation released by the labels on singles to promote the best tracks from the LP long time before the LP will be even pressed or available for sale. This is how the industry worked back in the day. Singles with labels like "promo use only or D.J. copy" is typical for any radio archives. One song per side. I believe @dertonarm is right at some point, there could be a dedicated tonearm with dedicated alignment made for professional use for japanese radiostations backs in the 70s.