Four EF50 valves, one complete and three dissected, 1939

Made:: 1939 in England

maker:: Mullard Limited

Four E.F.50 valves, RF pentode, one complete and three dissected, made by Mullard Limited, England, 1939

The EF50 was designed by Philips for use in early Band I television sets. It was also used extensively in radio and radar during World War Two. They had a short life span, and had to be changed frequently.

Details

Category:: Electronic Components

Object Number:: 1948-90

Materials:: plastic (unidentified), metal (unknown) and glass

Measurements:: complete valve: 80 mm x 50 mm diameter

type:: thermionic valve

credit:: Donated by the Mullard Radio Valve Company

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Parts

Mullard EF50 Valve, 1939

One complete EF50 valve, made by Mullard Limited, England, 1939

The EF50 radio valve, made by Mullard, was introduced commercially in 1946 but predates this - 1946 marked the year it was "demobbed" previously having being used by the British miliary Air Ministry VR91 or stores reference 10E/92. The EF50 was used in early British miliary radio sets during the Second World War and offered "a combination of technical innovation, versatility ... [and] distinctive appearance and the sheer volume of production." Many of the wartime radar sets containing EF50 became surplus in peacetime and were ingeniously converted into television receivers in the immediate post war years.