[Tubeglow20]

Wondering if anyone can give me some information about an output transformer on an AA5 that uses a 50C5 power output tube. The radio im working on is a Silvertone catalog number 6 radio. I've completed the recap and changed several of the out of tolerance resistors. When I checked the output transformer windings, the primary measures 336 ohms and the secondary measures .6 ohms. According to the schematic,  the primary should be 185 ohms and the secondary .6 ohms. Was wondering,  can output transformers go up in value like resistors do when they get old or could this be a change in the transformer specs when the radio was made. Sometimes manufacturers change specs and they don't make it into an updated schematic; I could be wrong here. Anyway, can I use this transformer or should Iook for a replacement? Don't want to burn up a tube or something. Thanks for any suggestions.