Your RCA K50 was made in 1939. These are 3 pages listed under schematics here on nostalgiaair. After schematics, click on "Rider by Original Index", RCA and model number.
Norm
: I have a 1939 RCA Victor model k50 and am searching for some info on this radio. An owners manual would be perfect, but even an old ad or any other info concerning this model would do just fine. I appreciate any help that is given. Thank you.