[Kenwood] OT Unknown power supply

[Max Harelik]

I've been given an inoperative regulated power supply with a generic 
circuit schematic that doesn't seem to represent what is actually in the 
supply. The only identification marks on the unit are (a) the capital 
letters "ER" (stylized, the E consisting the three horizontal bars only, 
followed by the R, and both letters leaning/slanted to the right), and 
(b) the apparent model number PS-109. It is rated at 13.8 volts (fixed), 
amperage at 30-32.

Googling various combinations gets nothing useful.

Does any one have any idea who made this thing?  Any leads will be 
appreciated.

73,
Max, K5OVW