AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B

Tony Duell ard.p850ug1 at
Sat Nov 10 14:05:46 CST 2018

On Sat, Nov 10, 2018 at 7:42 PM dwight via cctalk <cctalk at> wrote:
> He needs a larger pulley if going from 60 to 50 ( as a motor pulley ). It needs to be 20% bigger because the motor turns slower on 50 Hz. 6/5 to be exact.

I like the way Tektronix handled this issue in the 8560 (service manual on
Bitsavers). They produced a 60Hz supply by chopping rectified and
smoothed mains, thus the incoming mains frequency does not matter.
An 8560 will work in the States or in Europe with no pulley changes.



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