Hi. I found a few really old posts about this plug, but no part
numbers or sources. Anyone know where I can find one of these plugs?
One post said it was used on the HB-400 radio. It's round, with round
pins, shaped like a "Y" (or a crows foot).

Picture available he

http://www.combo-organ.com/plug.jpg

I don't need it for a CB, though. It was used on an old Rheem combo
(portable) organ for the volume pedal.