The PS-X50 is a PS-X70 without full-auto mode, without pitch control, without Litz wiring and without carbon-charged wand.
Bar very slightly lesser speed accuracy and startup time specs, the rest is the same : VTA-adjustable PUA-7 tonearm, diecast zinc armbase, BSL motor with Magndisc / X'Tal Lock control, amazing reliability... and sound quality !
The PS-X50 also sported Sony's unmatched mix of shiny & matte textures & assorted colors - looks do count as well when it comes to sales :)
The X50 also was available in Japan, later on, before vanishing as PS-X50W : "W" for wood but it ain't wood, it's a cheapish vinyl decor added
Alongwith the PS-X70, the PS-X50 is the original of the series : the PS-X60 and PS-X40 are later versions.
Like the earlier PS-X7, the X50 turned out to be one of Sony's bestselling turntable - and it wasn't cheap. The entire series is part of the most sold japanese turntables : there are tens of thousands of them around.
Add in a Denon DL-160 or a Sony XL-55 (the PUA-7 deserves good moving-coil cartridges, even heavyweights like the old DL-103) and you will be stunned by the results.
Quality, reliability and convenience all rolled into one : japanese engineering at its best.