Here's one on vinyl that few realize is a total delight - sonically and performance-wise. The Quartets Vol. 3 played by the Loewenguth Quartet on Vox Records (SVBX 544) three lp's with the purple "speakers" label. The playing is straightforward and sensitive, and the imaging / instrument separation is amazingly good - one of the best quartet recordings I have - mastered by Rudy Van Gelder, too.