Psu plug

[fordfalcon2003]

Hey guys was wondering if anybody knew anything about this preamp and the name of the plug for the power supply
Cheers

 

[JonSnell Electronic]

That is an outlet, due to the fact is is a polarised female socket but the maker may help you get an answer. Perhaps there is a makers part number on the rear.
Probably replace it with a more common 4 pin DIN style socket if you can't match it.