How to change Krell S-1000 voltage for Europe

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.

The amp needs not only rewiring, but also uploading a new software to work on 50Hz AC mains.

Krell does just tht but will do it for the original owner

You should be pre-warned, many hi end audio companies will refuse to change voltage in order to protect overseas distributors against various currency fluctuations. This prevents Europeans from buying North American gear at a lower cost or vice versa for some equipment, better to check first.

Thanks.

It will need to go back to Krell.