Marconi MkIB Television Camera
Power Supply Unit type T-A 174002.
This is the PSU for the camera channel, rear and front views.
The meter on the front panel reads the AC voltage on the main transformer
and the input tap switch below the meter was set to the place the meter
reading in the "Green".
An additional test meter could be plugged
into a jack socket to read the current in individual valves, selected
by the lower switch.
The main regulated supply was 250V DC at 800mA. Plus other voltages.