ahhh I thought linear was turntables with the strobey thing so you can adjust speed/pitch type thingymajig.
That would be 'direct drive' turntables - although there's really not much that says a belt-drive turntable can't have a variable speed drive other than direct drive is usually more 'accurate' wrt speed, and putting that kind of complexity into a belt-drive system wouldn't make much economical sense.