Don Preist's biographical and research files, drawing plans, and testing reports for his innovative work with transmitter tubes and klystrons with Eimac Inc. and Varian Associates.

Donald Harold Preist, born in England in 1916, first became associated with various aspects of radar development in the late 1930s when conducting early experiments on the detection of ships and the development of high-power ground radar transmitters. During the early part of the Second World War, Preist served as a flight lieutenant in the British Royal Air Force Volunteer Reserve and took part in the raid of Bruneval, France where a complete German radar installation was captured and analyzed by Preist for military intelligence purposes. In 1946, Preist became an Electronic Research Engineer with Eitel-McCullough Inc. (Eimac) in San Bruno, California, an early leading manufacturer of conventional radio tubes and microwave transmitter tubes that were used worldwide in radio and radar detectors.

10 Linear Feet (18 manuscript boxes; 1 carton; 1 flat box; 12 map-folders)

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