I have a Sony PS X800 TT that has a linear tracking as well as the "biotracing (vertical servo) arm. All the criticisms of servos that audiophiles cite do not apply to a well designed servo. No hunting, no offset. The arm pivots, so the servo does not need to deal with things like off center holes. The servo moves the pivot point, and the rate of movement follows any groove spacing variation. Tracking error is less than 0.05 degree.
There are five (count em) microprocessors in the darn thing.
There are five (count em) microprocessors in the darn thing.