As the arm is mounted, it's time to connect the motor control.
The motor control generates a sinewave to a 3-phase frequency controlled dc motor by an advanced circuit.
I never cared too much about speed, and I think it's not so sensitive as to +/- some %. A
constant speed however, that's important.
There's a 7-pole contact for the motor, and a 5-pole contact for the front panel control switches.
Motor control with start/stop, speed 33/45 and adjustment and storing of preferred speeds;
The front panel has the same functions for start/stop and 33/45;