Would anyone have a schematic for an RCA Victor model 3-X-521? It's a small table radio supposedly from 1951. Serial no. is U 124327.

It works, but hums fairly loudly. I see one burned resistor but I cannot make out the color code. When I know the value, I'll replace this bad resitor and hope the hum stops. Is it likely to be the fix?

Would appreciate any & all help.

Mark