[teetoon]

Hi. These motors are definately NOT compatible.
The BSR has a low voltage output on the 2 white wires to power a transistor amplifier and the Garrard will have a 90 volt tap on the red wire for valve heaters in series.
You can see in your second picture that the black motor wire connects to the live side of the switch and a dropper resistor. The white motor wire goes to the neutral side of the switch and to chassis. The red motor wire appears to connect to a thermistor which would feed the valve heaters.

The clue is in the brown and blue wires (on the BSR) being the mains colours at a much later date (1970?) and Garrard did use black and white as the mains connection on many 2 pole motors.

BSR motors with a 90 volt tap had brown and black as mains in and white as the 90 volt tap.
What did the BSR deck come out of ?

David.