A. MizuharaMicrowave Power Tube Products, Varian Associates, Inc. Palo Alto, CaliforniaThis article describes the design, construction, and performance testing of two Varian klystrons, model VKX-7864A, which replaced the aging and less efficient VA-949J klystrons in the X-band planetary radar transmitter on the Goldstone, California, 70-meter antenna. The project was carried out jointly by the Jet Propulsion Laboratory and Varian Associates. Output power was increased from 200 k W to 250 kW continuous wave per klystron, and full dc beam power is dissipated in the collector (it was not possible to operate the VA-949J klystrons without R F drive because of limited collector dissipation capability). Replacements were made with a minimum of transmitter modifications. The planetary radar transmitter is now operating successfully with these two klystrons.

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