[Arran]

I have a lot of problems with this assumption that the power line voltage is always to blame for a warm running power transformer, these sets were intended to run at least at a nominal voltage of 117 volts at 60 CPS, or 115 volts at 25 CPS, 119-120 volts does not sound excessive. on top of that I don't think that the Philco model 45 was noted for having a marginal power transformer unlike a brand Z set. While it certainly doesn't harm anything running the set at a lower line voltage, given that the set was worked on in recent years I think that it is just plain common sense to check the quality of their work first if the transformer is running warm. There are a lot of fly by night type "restorers" who will recap a set without even checking the original resistors, will clip and pigtail new parts on the leads of old ones, or even parallel an old part with a new part, not to mention making wiring errors. Unless I know who did the work I assume that something may have been done wrong.
Regards
Arran