[Arran]

 The Edcor ones should be fine, and less expensive then the Hammond ones, at least the universal Hammond types. Either make is probably of better quality then the failure prone originals, not only because of improvements in materials and winding technology but because Philco probably farmed out their output transformer manufacturing to the lowest bidder. Many of the early Philco output transformers fail too, although not at the same rate as the 1939-42 ones, with the 1939-42 ones it's almost part of the restoration routine along with the paper caps, resistors, and the wiring. At least with a 41-300 model the end result is worth the effort, if you plan on keeping the set, probably not worth it for resale.
Regards
Arran