Marconi MkIB Television Camera
CCU type T-C 113302.
This is the Camera Control Unit (CCU) valve side view. 28 valves
are used plus the CRT type 7C4P and the waveform tube type 3KP1.
Note the small 2 pin connector, centre top, this is a safety interlock
to remove the supplies if the covers was removed. This was very necessary
as the 6KV EHT for the CRT was mains derived and a shock could easily
be fatal.