[Arran]

I was just going to mention this, Philco had a habit of building multiple variants of the same chassis, according to what tubes, and other components were available. There is typically a code number, but also a production run number, fortunately I have the 1942 U.S Philco service manual, but it may not show every variation in the 42-380. These are extremely common sets so it's likely someone has posted a thread on every version by now. Audio output transformer failures are very common in the 1939-42 Philco AC models for some reason, I wondered if it may have something to do with the screen grid inversion scheme used in many of these sets but the single ended sets seem to have almost as many failures.
Regards
Arran