page_title: EF50
hierarchical_section_title: EF50
caption_attribution_description: English: EF50 pentode Polski: Pentoda EF50
context_page_description: 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. 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 the Netherlands 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, making it suitable for Very High Frequency use.
context_section_description: 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.  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 the Netherlands 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, making it suitable for Very High Frequency (VHF) use.
caption: EF50
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