I had a question about a RK Radio scamatic and I got a reply: just says model 6. Was that a person giving a reply or what?

Yes, that would be me. The site I gave, was information on a model 6 Keg Radio. Gives riders folder numbers. Same 5 tube line up you discribed.

http://www.antiqueradio.com/Aug08_Bintliff_RadioKeg.html