Kaar Engineering FMB-50A Power Supply
 

Picked up a Karr Engineering p.s. for free (abandoned in one of the
barns) at Hosstraders.

I am interested in learning what transmitter this paired up with. I
have some use for it, but as I
like to help complete sets, I am willing to part with it for a
reasonable price - warning, it is REALLY rusty.