The ebay seller is 'bdmerchandise'. I exchanged some emails with him and he seems pretty helpful if not completely aware of details on all these parts.
I got my unit today (the same aluminum box that Joe told us about). As I suspected, and posted earlier in this thread, it looks to be Glassman parts that are based on their ER series supplys. The multiplier module in these boxes is indeed an ER-series part and the transformer looks to be the one used in ER supplies. The ER series is 300 W output.
They had many options, like this:
ER10P30 ER10N30 ER10R30 0-10kV 0-30mA
ER15P20 ER15N20 ER15R20 0-15kV 0-20mA
ER20P15 ER20N15 ER20R15 0-20kV 0-15mA
ER25P12 ER25N12 ER25R12 0-25kV 0-12mA
ER30P10 ER30N10 ER30R10 0-30kV 0-10mA
ER40P7.5 ER40N7.5 ER40R7.5 0-40kV 0-7.5mA
ER50P6 ER50N6 ER50R6 0-50kV 0-6mA
ER60P5 ER60N5 ER60R5 0-60kV 0-5mA
ER75P4 ER75N4 ER75R4 0-75kV 0-4mA
In those, P = positive output, N = negative, and R = both (I think for R, you had to swap the multiplier module to change between P or N.) In the part numbers, the first number (before P/N/R) is kV and after is mA, so the product of those two numbers is 300 (watts).
The units the seller is striping down, I think, are some kind of big complex security xray scanners. I think this HV part powered a small xray tube.
So it looks to me that Glassman sold some custom design components that is very close to the ER supply.
The seller sent me some pictures and it looks to me that he has boards that are ER main boards, except the place that usually has the transformer on the board is unpopulated and the transformer and multiplier have been moved to this separate aluminum box. I think the board and one of these boxes can be paired to make an equivalent to an ER supply. Not simple... you'd need to figure out how to connect AC -- pots for V and I control (or voltages) -- meters or monitors for V and I -- how to connect between the board and this box.
I have purchased one of these ER-looking boards from the seller but don't have it yet. I think he said he had 8 total units that he is stripping down. I think he might be receptive to selling a package with both this box and one of the driver boards.
I can try to share more about how it looks after I get the board. So far, what I'm sharing here just looks good in theory.
Joe made his own driver for the transformer and says he is getting 700 or more watts out (more than twice the 300 W spec). I'm not sure if it is possible to get that power out of the original ER-style board. At minimum, I think that would take some hacking to the current sense which is an input control to the 3525 switcher chip.
Here's a link to one ER manual that has schematics. All the versions are about the same except for the number of stages in the multiplier and the polarity orientation of the diodes.
https://docs.google.com/file/d/0B7IIDFX ... xXTDg/edit
Hopefully I can add more after I get the board. If you contact the seller, tell him Rex