# Klystron **Entity class:** Technology **Research spine:** [[research/Chronology of Signals, Silos, and Sovereign Software - Research|Chronology of Signals, Silos, and Sovereign Software]] ## Definition The klystron is a microwave-amplifying vacuum tube developed by Russell and Sigurd Varian with Stanford support in 1937; it helped make microwave radio detection practical. ## Chronological Proximity In 1937 its development preceded the 1940 [[wiki/Cavity Magnetron|cavity magnetron]] and the wartime radar laboratories. ## Relational Proximity [[wiki/Varian Associates|Varian Associates]] grew from the Varian brothers' work, while [[wiki/Fred Terman|Fred Terman]] helped build the Stanford environment that commercialized it. ## Collection Routes [[collections/The Civilian Intelligence Marketplace|The Civilian Intelligence Marketplace]] · [[collections/Terrorism, Counterterrorism, and the Intelligence Environment|Terrorism, Counterterrorism, and the Intelligence Environment]] · [[wiki/Signals, Silos, and Sovereign Software|Signals, Silos, and Sovereign Software]] ## Sources / Provenance - [[research/Chronology of Signals, Silos, and Sovereign Software - Research|Chronology of Signals, Silos, and Sovereign Software - Research]].