Quote:
Originally Posted by Trevor
Garrad motors from the later period ran synchronous by virtue of the fact that they were fitted with a ceramic circular magnet on the rotor . when the motor was required to do some work it then relied on the caged roter
This being the case the stepped pulley would be of a different diameter to the earlier
motor
Trev
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That is the Synchro-Lab™ motor which came much later and was seen on the SL, AP series automatic turntables.
The original and the replacement motor tried here are pre 1960 pure induction motors.
Regards,
Anwesh