I would recommend checking with the manufacturer (duh!!). I just checked on a piece and it was only $50 to have it converted. All problems solved and no doubts.
Using a 220v piece in the US
I am thinking of buying a Phono step up device which runs at 220v. (Germany) I believe it is requires somewhat low power. I believe that there are voltage converters that I can buy. Will there be any sonic drawbacks from going this route?