[Arran]

Picked up a Rogers Magestic a while back that had a Perma Power Model A converter with it. Would that work with the Philco 222 as well?

 It should work, however I would want to rebuild the power supply electrically first, and then find out which settings to use for the number of tubes your set has. One thing to watch for is that Selenium rectifiers fail with age, that is the output current tends to drop, necessitating replacement. However it's not as simple as dropping modern silicon diodes/bridge rectifiers in as the internal resistance of a Selenium rectifier was higher then a silicon diode is, so that the output voltage using silicon rectifiers will be higher and will have to be compensated for on the "A"+ side. This can be handled in a number of ways such as with a wire wound resistor, but you can also use a number of silicon diodes connected in series across the load to bring the voltage down, about .7 vdc per diode. The filter capacitors inside the power supply will also need replacement.
  If you need a schematic for this set I have a set of Radio College Manuals and some Philco of Canada folders, but I can't guarantee that I have one for this set in the latter. You may not need one anyhow, more often then not these farm battery sets didn't encounter much servicing, in part because they were run for a low number of hours compared to an AC radio, and also because they ran cool and at lower operating voltages, and most were retired after AC power was introduced in a given area. This means that it's likely all original under the chassis, and all that you will need to do is carefully replace on component at a time, likely capacitors and possibly a few drifted resistors. If you want to test it you can connect ten 9 volts in series for the 90 volts B+ , and two or three "D" cells in parallel to supply the proper voltages, but don't mix the two up or you will be looking for a new set of tubes. You may find that this radio will still work after you connect the proper voltages to it, though I would still overhaul it if you intend to play it a lot. It looks like it was probably a decent performer though, in that it has a three gang tuning capacitor, that usually indicates that it has a tuned RF amplifier stage.
Regards
Arran