Hello, I just picked up a original radio for my 59 Apache. It needs some work and seems to be missing one of the tubes. Does anyone know where I can get a wiring diagram for this radio?

Also there are numerous wires and plugs on the radio. Two wires come out of the same hole in the shell. I assume one is power and the other is a speaker hookup (or is it a ground?). There are also two "plugs" in the radio. The one on the right side is obviously the antenna, but what is the smaller one on the bottom of the unit.

Thanks, any help is appreciated.