[Arran]

Yea. Good point about the space and finding a good place to vent off the heat
from the sand resister. As to the switch, it looks to be in good order.
Anyone ever had problems with the tuning cap (air)?

I don't know why sand resitors are being brought up, I don't know where you would get one of those these days but the old ones that they used to use in TVs were junk. The square porcelain wire wound ones are much better in that you can attach one side to the chassis as a heat sink, better still are the type with the aluminum shell that you can screw to the chassis, but again chassis space is at a premium in one of these sets never mind the ventilation. If your line voltage is around 120 V I wouldn't worry about dropping it, if it's above that I would build an external dropping device that you can plug the set into, including either a large wire wound resistor or a bucking transformer to knock the input voltage down 5 to 10 volts. Some would say more but 1R5 tubes are very fussy about how much B+ voltage they get, if it drops too much then it may stop oscillating.
Regards
Arran