[fwmartin2000]

I just acquired a 46-1209 (122) radio and while pulling and cleaning the tubes I noticed that the 1st converter tube was not the listed  7F8 dual triode, There was a 7AF7 dual triode installed. I know that the 7AF7 will work as the converter  but the tube pins are wired differently, so I checked and found that the tube socket was wired for a 7AF7 tube by checking the filament pins. I am wondering if the different tubes used as the converter is the difference between the 121 and 122 chassis. I have not seen any schematics that show the 2 different chassis numbers and that particular  7AF7 converter tube. I'm going to treat it like it's the waay it should be wired, even though my schematic shows differently.  Just curious.
Fred Martin