Here's the collection of parts
that were packed inside the case. Somewhat puzzling though as
none seem to be the original parts. A Mullard PM2 in a nice box,
but is it an expired example just packed in a new box? That was
the usual practice, just in case the old valve wasn't entirely
Next a Mullard PM1HL, and on its left
a Marconi valve with the code "MX40" and "BVA
37" on the opposite side. I'm afraid this valve has no connection
with the old KB radio because it's a pentagrid type with a 4
volt heater. The original valve might have been something like
a 215SG tetrode with a 2 volt filament.
Opposite is an early rotary switch.
Maybe a wavechange switch?