TWTs Provide Drive for High Power Systems
Vacuum tubes, now commonly referred to as vacuum electron devices (VED) are still essential to high-power RF/microwave military systems. While VEDs such as klystrons, crossed-field amplifiers (CFAs), gyrotrons, magnetrons, inductive output tubes (IOTs) and traveling wave tubes (TWTs), may represent older technology, they can achieve power levels still unmatched by transistors.
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