Pioneer PLC-1700

Ah ! Rare item.
While Sony was selling millions of TTS-3000, TTS-4000, Denon just as much DP-80 and Technics trillions of SP-10MK2, Pioneer never ever was too succesful with its drive/plinth/arm-less turntables, be they MU-7, MU-61, MU-3000, PLC-61, MU-1800, PLC-590 or later EM-10...
Like most of these, the PLC-1700 was Japan-only.

The speed accuracy is here aided by tw Hall elements which Pioneer managed to downsize to 0,3...0,5µ (0,8µ previously) with a special vacuum deposition system.

These elements detect magnetic status and feed the info to a DC Servo loop which controls turntable rotation with a capacitive oscillator and its negative rotor magnet PCB.
Victor in the TT-101 and TT-801 would push this to the limit by adding a second servo between the two PCBs that drive the rotor - but Pioneer was there two years earlier.

Braking is entirely electronic and the shaft is finished to a µ tolerance ; ± 4% individual pitch controls and a stroboscope light can be switched in.

3cm thick plywood finished in rosewood veneer makes the frame, a metal alloy sheet the base which rests on height-adjustable feet.

The simply rectangular PP-307 armbase can be drilled or simply copied to make as many bases as one wants.