Philco model 222

[Electronic M]

Depending on originality and experience level a schematic often is not necessary.

If I have a basic AM set like yours that has never been opened I don't bother to look for the schematic unless a labels missing or post recap/general parts testing there is some odd issue. If as set has been worked on and the work is sloppy or some modification, or there is some tough dog problem that is where a schematic becomes needed.

Of course I can hash out a good portion of the average AA5 circuit (and many other circuits) from tube data and memory of similar schematics...Granted I've probably had 250-500 radios come through my hands, and probably better than 175 cross my bench...When you do that many things start to stick in memory.