Accuphase can reset the voltage from 100v to 120v. They just re-solder a wire on a different tab on the main transformer. They do get some good money for a relatively simple conversion.
I would not run 100v equipment on a 120v! It may work & sound fine, but you're just asking for premature component failure.
I would not run 100v equipment on a 120v! It may work & sound fine, but you're just asking for premature component failure.