A lot of those ' cheap $30 220-110v step down transformer' MIC in the last few years are a safety worry,
every one I've had the displeasure of opening up, had wiring, assembly and shoddy labor issues as well as crappy crumbling brittle output connectors
This is on top of the fact they are not isolation transformers and dangerous to begin with, especially in a flipped Active/Neutral mains scenario
The older or vintage stepdown gear is the way to go, some are actually isolated

but still open them up, dust out and check before using,
and wack in a fuse on the output and input to be sure, if none present
Good for years, plug in, walk away..
