[Arran]

Hey Arran, I think you got me confused with Kirk (old restorer). This is Jeff W.  . But yes, I see where the 38-1 would be costlier, and not sell as many. That would be another reason to have leftover cabinets. The 38-1 did have push-pull output.

Sorry Jeff;
  I thought that Kirk replied to this thread saying that he had a 38-1. Actaully both the 38-3 and 38-1 have a push pull power output stage, but the 38-3 uses a different circuit, actually a simplified and cheaper circuit (Philco called it screen grid inversion) that only requires the two power output tubes and a first audio tube, there is no audio interstage transformer or a phase inverter/splitter tube. Philco used this in a number of models, but probably most prolifically in the early 1940s in their 40-180, 41-280, 42-380 and related models. Some say that the sets that use a proper phase inverter setup have a fuller sound, I don't know is that is true but they do have more output power.
Regards
Arran