dude, you just got so lucky!
i just happen to have one of these on the bench right now.
to wire it for 120 volt operation from a wall socket here is the pinout:
connect pins 1, 3, and 8 together using a piece of solid wire, about 18ga. or bigger.
connect the "hot" wire (smaller plug terminal) to pin 5.
connect the "neutral" wire (taller plug terminal) to pin 4.
now, as for where to find a 9 pin plug like you need, you're on your own for that.
however, you may just be able to use some sort of "bullet connectors" that fit around the pins on the back of the radio.
be careful. there are lethal voltages floating around inside that radio.
good luck,
LC