It's a Photonis XP3392/SP5 - used with gamma cameras and scintillators. The datasheet (
http://www.hzcphotonics.com/products/XP3392.pdf) specifies a divider very different from what was installed, but the divider board also had some features i couldn't make out without removing it completely, like an optocoupler to short dynode stages / some preamp stuff.
Board divider was : K D1 D2 D3 D4 D5 D6 D7 D8 A
4R R R R R R R R 0.75R R=2M
Datasheet reccomend K D1 D2 D3 D4 D5 D6 D7 D8 A
2 1.5 1.5 R R R R R 0.5R
Aside from the XP3392 I also got 3 Hamamatsu R1594 tubes, which I can't find much info on, and a Hamamatsu R268HA in a peltier cooled housing, complete with divider!
I'm liking the soldering with a copper heatsink option more and more - i'm really not comfortable with the mechanical strain of screwing a grub screw into the pin.
a last idea could be to get individual tube socket pins and push on, but they won't get very far from the spot welds.
--Chris