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EF50 In the field of electronics, the EF50 is an early all-glass wideband remote cutoff pentode designed in 1938 by Philips. It was a landmark in the development of vacuum tube technology, departing from construction techniques that were largely unchanged from light bulb designs. [1] Initially used in television receivers, it quickly gained a vital role in British radar, and great efforts were ...
EF50 is a vacuum pentode tube developed by Philips in 1938/39 for TV and radar applications. Learn about its features, variants, prices, and usage in various models and collections.
EF50 is a red valve designed by Philips in 1938 for Band I television receivers and widely used in radio and radar during WWII. Learn about its history, pin connections, datasheet and applications.
Learn how the EF50, a glass pentode tube developed by Philips in 1938, revolutionized high-frequency applications such as television and RADAR. Discover its history, construction, and impact on radio technology.
The EF50 in contrast had, like all "modern" radio tubes, a base made from pressed glass. This enabled the designers at Philips to combine superior performance with a low-cost high volume production technology in a single tube.
The Return of the Redcoat The valve in question was the EF50, which became available for television use in 1939. At this time all the valves were being manufactured in Holland. The construction of the Mullard EF50 is of interest because it marked a significant departure from the conventional types used in Britain at the time (see Figure 3).
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As shown in Fig. 1, the control grid connection of the EF50 has been taken to the base. In the pinch construction this would not be permissible, because it would give rise to insufficient screening between the control grid and the anode and heater. The external screen (F) and the internal screen ensure very small anode-to-grid and heater-to-grid capacities in the EF50. The anode-grid capacity ...
The two tubes employed by the set were the EF50, which were probably available in large supply from surplus equipment. The tube, which has been called " the Tube that helped to Win the War," was a major concern during the early days of the war. It was very versatile with uses in VHF and radar equipment. And it was manufactured by Philips in Holland, which was about to be overrun by the ...
The production line needed to be moved to Britain, and when the HMS Windsor took the escaping Dutch government to England, the Philips family was also onboard with the diamond dies needed to produce the fine tungsten wires used in the EF50 tube. After the war, the EF50 would find a home in many oscilloscopes and radio receivers.