08-13-2010, 09:45 PM
I'm wondering if anyone can tell me why Philco used certain tubes in some of their radios, specifically, why, for example, in some 1942 models for a nine tube circuit, was there a mixture of an octal, (5Y4G), two sixpin tubes, (type 41), and the remaining being Loctals, or "Loktal" tubes as Philco called them? Wasn't the type 41 by then largely replaced by octal types? I don't know if it had to do with industrial rivalry, marketing of the "Loktal", or to avoid paying license for certain types. Anyone got a clue? 
