[Mondial]

Resistor 60 is the main bias resistor, so all of the B+ supply return current passes through it. Any overload on the B+ supply will cause that resistor to overheat.

Does the resistor get hot immediately on turn on or does it only happen after the tubes warm up?

As someone mentioned previously, remove the 84 tube and check the resistor. Then replace the 84 and remove the two 41 tubes and see if it overheats. The 41's draw the majority of the B+ current in the radio and would be my prime suspects if everything is otherwise wired correctly.