I was a young subscriber to Popular Science back in the early 70s, and recall quite clearly the photograph and description in the February 1975 issue of what was then an outrageously expensive turntable but a very cool design. I'm surprised you didn't know about this one Michael, but it probably remained quite obscure.
Cheers, Greg
http://books.google.com/books?id=WwEAAAAAMBAJ&pg=PA76&lpg=PA76&dq=popula...