McIntosh MC 601 Current conversion from 110 to 220 Volt

I am moving to Europe and I have 4 MC-601 Monoblock Amps. Country I am going to has 220Volt. My amps were US 110Volt. Any suggestions of where and who will modify these amps to Mac Specs. Not dinky corner electronic store. Is it possible to be done in US prior to my Departure??

I would appreciate a recommendation