[Milsurplus] PP-106 Power supply info needed

[Kenneth G. Gordon]

This weekend, while I was in Missoula, Montana moving a pile of 
equipment, I found 4 ea PP-106 power supplies. These appear to be a 
variable +HV supply. 

A meter that reads 0 to 500 VDC and a pot or other adjustment just 
under the meter. 115 VAC 60 CPS 1phase input.

Would anyone happen to have a schematic diagram of this thing, or 
know what it originally went with?

Ken W7EKB