I'm working on a set with the BRC1500 chassis and as it's a keeper I'm treating it to a spanking new dropper. I note that the rather tired one I'm taking out has an additional 80 ohm fusible resistor in series with the 350 ohm HT dropper section (R125). The leg of the dropper has been cut and this resistor let in.
The original BRC service info from 1970 makes no reference to this, but the set I'm working on is a fairly late one from 1973/4 so I'm wondering if this is a later mod or if it's just been fitted by a service engineer in the past. I should add that the original section of the dropper still reads the correct 350 ohm resistance, so the additional resistor takes it over the factory spec somewhat.
Any thoughts welcome!