My EU upright has it original built in stepdown transformer and works straight from a 230-240v UK socket.
Internally it's all 100v so any equipment you power from its internal cabling must accept 100v.
As for V/A output it is at least capable of over 500W as it can power a Lindbergh of which its PSU is capable of 350W along with the original monitor which can be around the 200W mark. Plus about 40w more for the sound amp and top light.
I'm Running a Sega ALLS in mine which has a 400w PSU, but my monitor is a modern LED which uses only 25w.