Check out McMaster Carr.  I believe I purchased a 220 to 600 Vac step up
transformer from them at a different job.  I used a 110 to 220 step up to
drive it, and sized out all the KVA's.  Worked ok, since it was designed to
do this.  I don't think I spent more than $100 on the transformers.

Scott F. Touchton
1550 Engineering Manager
JDS Uniphase

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