ok 1942, SHOULD be all octal socketed tubes.
https://archive.org/details/RCA_RC-16_1950 the book will give you pinouts of the tubes, some clue what the working voltages on the tubes should be, and at the back of the book, are circuit diagrams for various radios, amplifiers, and i think maybe even some TV circuits... one little secret... Philco often ripped circuits from RCA's reference schematics, so you might actually find something in the RCA book that matches that Philco by 90% or better...
one note of caution, if you only have one iron core transformer in the radio (connected to the speaker), then you have a transformerless power supply, (also known as an AC-DC or "hot chassis" design)... if this is the case, make sure the radio has it's original polarized power cord, and your outlets are properly wired before working on this radio... the chassis ground is hard wired to the neutral side of the plug, and if you plug it in backwards to an outlet, or to an outlet that's miswired, you will have raw line voltage on the chassis ground, which is dangerous.... it's actually best to use an isolation transformer to work on such radios....
if the radio has a power transformer AND an audio output transformer, then it's ok to work on it without an isolation transformer...
a couple of hints: all of the tubes should have a slight positive voltage on the cathodes (measured from ground) if they have cathode resistors, and 0 to a few volts negative on the grids MEASURED FROM THE CATHODES. if the cathodes are grounded, then there should be a slight negative bias on the grid measured from ground. there should be a pretty reasonable voltage drop across plate resistors for each tube. for a B+ (power supply) voltage of 150V, there should be about 100V on the plate. if there's a screen grid, it's voltage should be about 10% or so higher.
it's mainly the voltage drop across the cathode resistors and the plate voltages, and the plate resistor voltage drops that will tell you if a tube is operating properly.
if there's a blue or pink glow in a tube, it has some gas in it, and should be replaced. if the silver coating on the inside of a tube is missing or looks like a white powder, there's atmospheric pressure air in the tube and must be replaced...