I live in the UK and I've got a 5150 Model A which has a black 120V PSU. I am quite keen to get it running from 220V without a step-down transformer.
I've spent the last few days studying the schematic and can see that is very likely possible. There very clearly is not any switch, jumper or even a set of fitting options to convert it but theoretically it looks possible.
Does anyone have even a photograph of the insides of the black 63W 220V supply? Did one even exist?