[Arran]

The RCC manuals show a model 53 (not a 53A or 53A S) from those years but the tube lineup is different as is the tube count. The manual shows a 6J8EG, a 78E, a 6J5G, a 6K5, a 6F6EG, and a type 80, all are in a straight line across the back of the chassis. Your example has obviously been played with, the speaker is not of the stock kind that Philco would use, to me it looks like a Utah or a Jensen, and Philco would not have mounted a transformer (output transformer?)on the chassis shelf from the factory.
Regards
Arran