Funny you mention that!
I got mine in japan, 100V
Ran it thru a step-down TxFormer 120V-100V, still sounds great
Now I live in Germany, so Im going thru a 230V-120V Txformer, then into a 120V-100V TxFormer, still sounds great! I couldnt believe it, I was expecting the exact opposite to happen.
Also...someone mentioned that they sound better with M/B tubes...I wonder.
I worked with a dude who was like Rain Man when it comes to electronics, he was telling me there's only one or two plants left in the world that manufacture tubes, so most brands tubes are all from the same plant...
Whether or not this is true I dont know...