Well, I _just_ brought back the Ms. (during a Feyenoord football match, I almost forgot about that, but it was _during_ so very quite near the storage location
I was away again well before the end of the match (sadly they played 1-1).
Anyway, I just examined the transformer and we are out of luck (if you can actually say that when you own a Ms.Pac):
The transformer has a range of tabs, but the voltages are between 90V and 117VAC........so there is no way to switch this to 220V.
So this will either require a 220 to 110V transformer OR finding a transformer with the right secondary voltages (very hard to find) or a "Euro" Midway transformer. Also hard to find and shipping transformers is pretty costly because of the weight.
All in all, the step-down (220-110VAC) transformer is actually the best option in this case. I do suggest getting something above 150W.
I didn't find any power data (yet) on a Ms.Pac cab but the usual figure is around 120W so a 100W transformer is simply too low and having a little extra is a guarantee that the transformer won't be constantly running "on it's toes".
I will be building the extra transformer into the cab as I hate extra external transformers "floating" around. I may even still have an extra one around....Gyruss where did you buy yours and what did it cost ?