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What are the diodes used for
A thermionic diode is a consisting of a sealed, evacuated glass or metal envelope containing two : a and a . The cathode is either indirectly heated or directly heated. If indirect heating is employed, a heater is included in the envelope. In operation, the cathode is heated to, around 800–1,000 °C (1,470–1,830 °F). A directly heated cathode is made of tungsten wire and is heated by a current passed through it from an external voltag.
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