[Arran]

Hello Steve.  The model 20 was the first Philco I started with. It was my grandparents, and was in about the same shape as yours.  At first look it appears someone put an octal tube substitute in the chassis.  That should be an 80 rectifier.  Chuck Schwark has a great set of paperwork available for this set that you can order from him.  You'll get plenty of practice rebuilding bakelite blocks with this radio, and the filter block can look a little intimidating at first but really isn't that difficult to gut and rebuild.  There are lots of posts here if you research about this set.  Hope the speaker checks out OK. K type speakers are getting pretty scarce.  Take care, Gary

 Actaully I think that may be a later production type #80 tube as the rivets look original and undisturbed. Believe it or not they manufactured #80s in Japan right into the 1970s with a GT style envelope, I've run into them a few times over the years. Just like in North American radios the type 80 became kind of a default rectifier tube and was used in many radios over a span of 20+ years.
Regards
Arran