![File:Klystron tube, 425 MHz, Varian Corporation, 1959, used in Thule, Greenland, radar station - National Museum of American History - DSC00012.jpg - Wikimedia Commons File:Klystron tube, 425 MHz, Varian Corporation, 1959, used in Thule, Greenland, radar station - National Museum of American History - DSC00012.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Klystron_tube%2C_425_MHz%2C_Varian_Corporation%2C_1959%2C_used_in_Thule%2C_Greenland%2C_radar_station_-_National_Museum_of_American_History_-_DSC00012.jpg/1200px-Klystron_tube%2C_425_MHz%2C_Varian_Corporation%2C_1959%2C_used_in_Thule%2C_Greenland%2C_radar_station_-_National_Museum_of_American_History_-_DSC00012.jpg)
File:Klystron tube, 425 MHz, Varian Corporation, 1959, used in Thule, Greenland, radar station - National Museum of American History - DSC00012.jpg - Wikimedia Commons
![A high-power Klystron - used to generate radar power before the invention of the magnetron. - Picture of RAF Air Defence Radar Museum, Neatishead - Tripadvisor A high-power Klystron - used to generate radar power before the invention of the magnetron. - Picture of RAF Air Defence Radar Museum, Neatishead - Tripadvisor](https://media-cdn.tripadvisor.com/media/photo-s/18/4c/44/e8/a-high-power-klystron.jpg)
A high-power Klystron - used to generate radar power before the invention of the magnetron. - Picture of RAF Air Defence Radar Museum, Neatishead - Tripadvisor
![Airborne radar. Airplanes; Guided missiles. 11-2] THE KLYSTRON 595 between the electrons would cause the beam to expand and be lost to the walls of the drift tubes between cavities if Airborne radar. Airplanes; Guided missiles. 11-2] THE KLYSTRON 595 between the electrons would cause the beam to expand and be lost to the walls of the drift tubes between cavities if](https://c8.alamy.com/comp/RPXJ5F/airborne-radar-airplanes-guided-missiles-11-2-the-klystron-595-between-the-electrons-would-cause-the-beam-to-expand-and-be-lost-to-the-walls-of-the-drift-tubes-between-cavities-if-additional-magnetic-focusing-were-not-provided-to-constrain-and-collimate-the-electron-beam-the-beam-is-brought-into-a-strong-magnetic-field-parallel-to-the-beam-axis-this-magnetic-field-is-continued-until-the-beam-has-passed-through-the-final-cavity-and-is-then-removed-this-allows-the-electron-beam-to-spread-because-of-its-own-space-charge-until-the-power-density-in-the-beam-is-reduced-to-an-acceptably-lo-RPXJ5F.jpg)