Thanks Cschneider, that's kind of what I was thinking. I thought the last one I saw on Ebay went for around $300, so I'll probably go that route, unless I get a good offer. Here are some pictures of the actual system. It comes with the power supply and is in working condition. Some information from the bottom:
Model PHC 004C
Copyright 1979
Serial 0114405 LTA3780
Assembled in USA
Power supply is Adaptor Model AC9500, has the prongs coming directly off the transformer unit (ie. transformer is not in the middle of the wires). It says output:
Pins 1,2
16.0VAC 36.0VA
Pins 2,4
8.0VAC 1.0VA
Edit: Did some more research: bottom is textured, not shiny like the back, and no earphone plug, so looks like a later one like Ksarul suggests below... Looks like the LTA3780 means Week 37 of 1980.