Integrated amp, best conversion 220 to 110 volts?


Greetings all. I have a Marantz integrated amp from Europe that utilizes 220 volts and want to convert it to operate on American 110. What's the best way to go about this?
Replace the internal toroid or add an external step-up? If the former, where can I obtain a superior, audio-grade (perhaps oxygen free copper)transformer?
pmboyd
Just because all of the wires are used, doesn't mean it isn't convertable. A transformer designed for both 110 and 220V operation will have 2 primary windings. When wired for 220, the 2 primaries are in series and when used for 110, they are in parallel.
Audio tech says the torroid is custom made and there aren't two primary windings so I have to either replace it or use a step-up xformer. Suggestions?
So where can I get a reasonably priced audio-grade torroid or other xformer for the amp?