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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 ideas of the time essentially unchanged from light bulb designs.〔(【引用サイトリンク】url=http://www.dos4ever.com/EF50/EF50.html )〕 Initially used in television receivers, it quickly gained a vital role in British radar and great efforts were made to secure a continuing supply of the device as Holland fell in World War II.
The vacuum tube itself is a 9-pin Loctal-socket device with short internal wires to nine short chromium-iron pins, making it suitable for Very High Frequency use.〔(【引用サイトリンク】url=http://www.r-type.org/articles/art-021.htm )〕
==History==
The EF50 was preceded by RCA's acorn design and several other attempts, such as the “Stahlröhre” from Telefunken, to reduce inductance in the wire leads, all with some disadvantages. Philips had been working since 1934/5 on an alternative that would solve the problems of the other bases, and a design that could be produced cheaply and in large quantities. A presentation given by M.J.O. Strutt from the tube development group at Philips Research at the first “Internationale Fernseh-Tagung in Zürich” (international television conference in Zürich) described their work in September 1938. A few months later Professor J.L.H. Jonker, who had a leading role in the development of the EF50, published an internal Philips Research Technical Note, Titled: “New radio Tube Constructions”. Jonker's role was confirmed decades later by Th.P.Tromp, head of radio-valve manufacturing and production: "Prof. Dr. Jonker (head of development lab of electronic valves in the mid thirties) was the originator of the EF50 and this development started already as far back as 1934/1935. It was indeed developed in view of possible television application."
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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