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Why this small vacuum tube can be China’s big advantage in electronic warfare

In a defence tech laboratory in Beijing, a research team powers up a vacuum tube about the size of a pistol. Inside, a stream of electrons surges through thin coiled wires, amplifying microwave pulses ranging from 8 to 18 gigahertz with more than 500 watts of output – performance metrics that until recently were only achievable in devices much bigger. It is the new heart of China’s advanced radar and electronic warfare systems – a miniaturised travelling-wave tube (TWT), and a symbol of how...


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