Step-Down transformer with enclosure 1000VA
[VT1000ESG-S]

STEP DOWN transfomer for connecting 110-120V US devices to 220-250V AC supply
1000VA, 230/115V black metal enclosure, with mains switch and fuse, 2 US-3-conductor mainssocket with propper grounding

1000VA is plenty power, enough for all known guitar amps and also for the high power bass ams like the Ampeg SVT