DaveC wrote:


By my mind that is backward: the pinch roller is passive (not being driven).
The capstan shaft (~2mm diam) is driven by capstan flywheel/belt/motor
pulley.


** Tape speed is determined by the surface speed of the motor pulley divided by the flywheel to capstan diameter ratio.

That ratio might be 20:1 making the pulley surface speed 37.5 inches/S for a standard cassette speed of 1-7/8 inches/S.


..... Phil