[Arran]

The 38-22CS didn't use a curtain burner, as a matter of fact I don't think that any Philco AC/DC set ever had a line dropper built into the power cord. The 38-22CS would have used a plug in ballast tube on top of the chassis, so it's really not a big deal to deal with. Most sets that used a line dropping power cord were really cheap sets with a compact chassis, the 38-22CS would have used the same chassis as a 38-7CS but without a power transformer, so if you don't want a ballast resistor there is room to use a capacitive dropper.
Regards
Arran