[7chip7]

I have a bit of a dilemma that concern the rectifier tube in my 37-61 ,  the model calls for a 5Y4 rectifier, but my radio came with a 5Y3 , the socket is also set up for a 5Y3, I am wondering if some of the 37-61s ever came from the factory with 5Y4s or did someone rewire it. I know even though the 2 tubes do the same thing but the pin outs are different . The cant be interchanged without changing the wiring. I never would noticed this if my radio hadn't come with the rectifier tube, I would have gone by what the schematic and documents said. 
Chip