[Arran]

Actually the 6J8EG is an octal based tube, but the #41s and the #84 were six pins, the 7B7 and 7C6 were loctals. I'm guess that the eighth tube was from someone adding a phase invertor as opposed to the screen grid inversion setup the radio had according to the tube chart. Incidentally I think the rectifier tube was put in the wrong socket, although it was rewired to accept a 5Y3/5Y4 but there would be no reason to relocate it, power transformer may also be a replacement. Schematics for Canadian Philco sets were published in the RCC manuals, and whilst many were copies of U.S sets many had changes made like different tube types substituted, and more cloth wire and less gutta percha/rubber wire used. 
Regards
Arran