I inherited what looks like a 1970's kit-amp and I really need help finding out what it is. There is no writing on it of any kind except for "Radio Filter" imprinted on a small box connected to the power cord. It was my father's (who was an electrical engineer), and it was "bundled up" with a Southwest Technical Products Corporation (SWTPC) "198/A Preamp" (found here: http://www.swtpc.com/mholley/Catalog6/Page01.jpg). I searched the internet for pictures of SWTPC kit-amps of that era, but had no luck. I know my dad built both of them, so I would love to put them to good use, but I don't want to hook them up without knowing more (especially about the power amp).
Thanks in advance!

The following pictures are:
(1) Amp front-exterior (2) interior (3) Filter? connected to cord (4) rear-exterior
   

I'm in a band that plays a "funky & jazzy" style of reggae & ska. I would like to get the best amp to play those styles live. I am currently playing through a Behringer GMX212 because it was the loudest thing I could afford at the time. I have a Strat and LP. We play house parties (we don't have a P.A., so I need decent volume) and bars occasionally. Now I have a little more money though - around $350 plus the value of my Behringer - and I would like to get something better (and cleaner!) A friend says I should find a used Roland JC-120, but since I have some experience with electronics, I'm toying with the idea of building an amp. Any suggestions? Tube or trans?
Thanks for your help