Ran 220v tube preamp using off the shelf converter with no discernable ill effects.
Get the 500w version.
https://www.amazon.com/dp/B004MPR3XQ/ref=asc_df_B004MPR3WW4794928/?tag=hyprod-20&creative=394997...
Get the 500w version.
https://www.amazon.com/dp/B004MPR3XQ/ref=asc_df_B004MPR3WW4794928/?tag=hyprod-20&creative=394997...