[Geoman]

so the 2nd new old stock PSU was a delivery of initially 3 packages in November 1989. The one that is now powering the Crimson is

Code:

MMAX95-11Y0Y2Y2Y/115-230AT SW

this (marked 1/3) is powering on once it gets power without any load and delivering the voltages right away.

The spare I got on Friday is marked 2/3, and has no "SW" its model number. It powers on with fan spin, but no voltages at all.

On Jan-Jaaps image he had his MITE on a testbench.
There is a DB15 adapter marked as "J1", is it true, that PIN11 is connected to +5V and PIN9 is connected to -V5?
   

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So of course I took it apart to get some pictures. It's as new as new can be, a part of some minor rusty screws. I won't take it further apart, since I'm lacking the time and abilities to troubleshoot it. Perhaps the seller someday will find the third and last one of this batch too...

Compared to the one that is working in Crimson now which has grey capacitors, in this PSU there are three big blue capacitors marked "Aerovox M".