Klystron_Early-USA

This tube looks to be one of the very early klystron devices manufactured by Sperry Gyroscope Company and based upon the work of Varian brothers at the Stanford University. Prototypes similar as per manufacture and in operation at Stanford appears in Electronics, January 1940. In November the cover of Electronics is dedicated to the high-power variant developed by Westinghouse under Sperry patents. The above sample is complete with a Type 11-C tuner and the feedback coaxial loop. There is a number, 25378, printed on the body. Looking at the references given in Electronics, the above sample could be dated somewhere from the late 1939 to 1940.

The electron beam travels from the cathode, through the control grid, the focusing electrode and then through the two resonating cavities, the buncher and the catcher. Instead of a collector, the tube uses a deflector electrode biased at the cathode potential, in order to deflect electrons toward the metal top ring terminating the upper cavity. The cavity itself and partially the tuner act as radiator for the heath generated by the electron beam. Each cavity has two coaxial connectors, usable for input and/or output connection and for the feedback loop when needed. Tuning was accomplished by compression applied to the tuning rings, so to vary the grid spacing of the resonators.

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