[codefox1]

If it sounds good, enough volume, and you have enough room for it, it's probably OK. You could always use a "universal" replacement transformer to match the plate/voice coil impedence more closely to the tube and speaker at hand, but it's not critical.

You can carefully dissasemble the old output transformer, and you might get lucky and find a bad connection on the primary side that you can fix. Anyway nothing to lose by trying.