In electronics, a micropup is a style of triode vacuum tube (valve) developed during World War II for use at very high frequencies such as those used in radar. They are characterized by an external anode block, which allows better heat dissipation. These tubes could deliver radio frequency power on the order of kilowatts at wavelengths as short as 25 cm, and on the order of 100 kW at 200 MHz in pulses. Micropup tubes used very high voltages to minimize the transit time of electrons between anode and cathode.
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