Thanks for the info, Susan. I did some searching around, and found out this was the base supply for the MCX-100. There were 2 models listed, TPN1136A and TPN1154. The 1154 is the heavier of the two supplies, and has 2 pass transistors instead of one. Looks like it should run a 25-30 watt radio no problem.
So far, I've replaced the power cord, repainted the case, and added binding posts/bannana jack connectors on the output. Output DC looks clean, and regulation is stable, but it is putting out 15.5v instead of the rated 14.1v. I'll need to do some tweaking there. 15.5v seems a little "hot" for most 13.8v radios and other equipment I'd like to run.
If anyone has a schematic, I'd like to have a copy for my records.