Identifying TO-3 w/HP house numbering

Tue Oct 16 00:21:47 CDT 2018

Hey all --

Got an HP 2382A terminal I'm attempting to resurrect.  I get no video, no
heater, no high voltage.  What I believe to be the horizontal output
transistor appears to be bad, but I'm not sure if this thing contains
internal diodes that might be throwing off my testing attempts.  It's
labeled "1854-0900."  Anyone know what this actually is?  (Anyone have a
service manual for this terminal?)

Thanks,
Josh