These are big mambo-jumbo caps in a linear supply, specifically a
nameless S-100 system. I'm not sure if it's feasible to remove them.
They're screwed into the motherboard, and while I could disassemble the
motherboard from the chassis, it might still be a pain to get them out.
Controlling the voltage into them is pretty easy, via the Variac.
Limiting the current is a whole 'nother problem. Maybe a light bulb in
series with the Variac?
--jc