indirectly heated cathode

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indirectly heated cathode [‚in·də′rek·lē ¦hēd·əd ′kath‚ōd]

(electronics)

A cathode to which heat is supplied by an independent heater element in a thermionic tube; this cathode has the same potential on its entire surface, whereas the potential along a directly heated filament varies from one end to the other. Also known as equipotential cathode; heater-type cathode; unipotential cathode.

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