For _years_ while I was in Israel I ran both my Duo-Art and
Ampico reproducing pianos on a 120-volt 60 Hz motor with a simple
220-to-110-volt step-down transformer.  The piano motor didn't
even warm up so I was fine with it.

I _did_ increase the size of the pulley to compensate [for 50 Hz
mains frequency] as the motor ran much slower, as was mentioned.

Eli Shahar