[Mondial]

Looks like someone did a lot of mods to that radio. I see a pair of silicon diode rectifiers bridged across the 84 rectifier tube socket.

Perhaps this is why there was no 84 tube present in the radio, as it was bypassed with the rectifier diodes and the tube was then not needed.

If that resistor does not appear on the schematic, the maybe someone added it to reduce the higher B+ produced by the silicon rectifiers compared to the stock 84 tube.