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• n  an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation

• A receiver with a "klystron," "lighthouse" or other oscillating tube, used to convert the microwave echo to a lower radio frequency so that it can be amplified.
• Across the far north of Canada and Alaska, Litton klystron tubes generate radar beams for the Distant Early Warning line.
• Today, as the biggest producer of the klystron tube, which guides Air Force missiles and irradiates Army food, Varian has grown from seven employees to 1,230, did an annual .