Gerry O’Hara
CVRS Member

I am now convinced that someone had added that tube socket: the heater connections (pins 1 and 2) have been connected to the heater connections of the adjacent RF amplifier tube socket, the cathode (pin 4) is not connected to anything and the plate and grid (pins 2 and 3) have been connected together but not to anything else – go figure! So I think this is very likely an 8-tube R7 chassis after all (but with 24A tubes subbed for the 35s). The investigation continues…