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 made to secure a continuing supply of the device as Holland fell in World War II.
The EF50 tube is a 9-pin Loctal-socket device with short internal wires to nine short chromium-iron pins. The short wiring was key to making it suitable for Very High Frequency (VHF) use.[2]
- ^ "The EF50, the Tube that helped to Win the War". Retrieved 22 May 2014.
- ^ "The Famous EF50 of WW2 by Keith Thrower". Retrieved 22 May 2014.