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.