[Mondial]

That's a good point, Ron. Today's higher line voltage will increase the power dissipated in the resistors by about 15% to 20%, but I would assume the engineers involved designed the radio to withstand worst case high line conditions.

All the more reason to use a bucking transformer when operating these old sets.

As you mentioned, I would expect the chassis to get as hot with the old Candohm as it did with the new replacements. As long as the resistance and the mounting location is the same, the power dissipated and the resulting temperature would be identical.