Marconi MkIII PSU with front and side views (before restoration)  
Marconi MkIII PSU with front and side views (before restoration)
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This is the portable version of the Power Supply Unit (PSU) for the marconi Mk III camera, front and side views shown above. The side view is before restoration and is a bit grubby. Of note is the white box to the right of the fan. In order to keep the weight to a reasonable level, this contained a forced air cooled transformer that had a reduced iron core and thinner windings! Seventeen valves were used in this to supply all the regulated voltages needed. The meter on the front measured the mains voltage and it was set to be in the green by the right hand knob. The left hand knob selected the parameter to be measured by the external meter which plugged into the jack socket at the bottom.