http://antiqueradio.org/art/RCA8-PT-7010-SVC.pdf
Checking the schematic, it does have a power transformer. I'm actually familiar with the European selectable input transformers - my Norelco tape recorder has one.
So, besides the possibility of modifying the circuits to match the NTSC standard more fully, it sounds like getting this to run in the US is just a matter of having a new transformer made and swapping it in.
I wonder how difficult it would be to MAKE that NTSC conversion. Even if it would technically work as is, it would save a lot of headache in the future to make it match other American sets, though having a region frankenset would be kinda neat.