[Arran]

Mike;
 AI think a lot of the sound quality of Brand Z sets has to do with the quality of the speakers, and also the tone shaping circuitry they added, unlike Philco they used an outside supplier for the speakers, Rola was one I think. One of the best sounding consoles I have is a Canadian Westinghouse model 527X, used a 10'' Magnavox, but also had two tone controls, one a switch, the other a pot, in a very solid cabinet, and it's only a five tube set with a 6F6G.
Regards
Arran