Low power A unit from 50KW MF Transmitter, made by Marconi's Wireless Telegraphy Company Limited, Chelmsford, Essex, England, 1929. In service at BBC Brookmans Park 1929 - 1979 Low-power 'A' unit from 50KW m.f. transmitter 1929
Eleven valves and nine wirewound resistors from Low Power A Unit 50 kW MF Brookmans Park Transmitter, made by the Marconi Company Limited, England, 1929-1979 Eleven valves and nine wirewound resistors from Low Power A Unit transmitter, 1929 1929
Two cathode-ray tubes type HR2/100/1.5A, made by A.E.G. for Freya and Coast Watcher radar, German, 1939-45 Two cathode-ray tubes type HR2/100/1.5A for Freya and Coast Watcher radar
Illuminated display describing the manufacture of a junction transistor Illuminated display describing the manufacture of a junction transistor
Portable traffic-light column and controller, for use with radar sensor. Portable traffic-light column and controller, for use with radar sensor.
Cathode-ray tube type HRP2/100/1.5Ash, with flat screen bearing scale 0-200, made by A.E. C. for Freya and Coast Watcher radars, German, 1939-45. (Note: final symbol in type number given here as `h', is dubious, that is type number is more likely to be HRP2/100/1.5As). Cathode-ray tube type HRP2/100/1.5Ash for Freya and Coast Watcher radars