Umm. No.
That transformer is a ferro-resonant transformer. It
*needs* 3-phase to work! It supplies the basic 12v DC that are then
used to by the linear regulators. It's those that burn the power as
heat. Replacing the linear regulators with switchers will reduce the
consumed power by a lot.
Since extremely high current switchers are relatively cheap (at least
compared to getting three-phase installed, and massive aircon systems),
is there any reason why you *wouldn't* go down this route? Particularly
for a machine that's going to be on a lot?
Err, historical accuracy? The PSU is as much a part of the system design
as the CPU (OK, maybe I exagerate, but not by very much). I know that if
I owned a large adn rare machine (large VAX, PDP10, etc), I'd want to
keep it as original as possile.
-tony