It will need to go back to Krell.
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One option is to buy one of the older PS Audio power regenerators. These can be set to input 220V/50Hz and output 110V/60Hz. The other option (I have done this twice with an old Krell HTS, I was not the originally purchase either) is to have Krell convert it for you. I believe Krell charged me 300 euro in France and they did the conversion for free (?) when I returned to the USA.