Pentode



[pen-tohd] /ˈpɛn toʊd/

noun, Electronics.
1.
a vacuum tube having five electrodes, usually a plate, three grids, and a cathode, within the same envelope.
/ˈpɛntəʊd/
noun
1.
an electronic valve having five electrodes: a cathode, anode, and three grids
2.
(modifier) (of a transistor) having three terminals at the base or gate
pentode
(pěn’tōd’)
Any electron tube with the basic structure and functionality of a triode, but including two extra electrodes, a screen and a suppressor grid. The screen helps the tube respond well at high frequencies (as in a tetrode), while a negatively charged suppressor grid adjacent to the plate prevents secondary emission of electrons from the plate, increasing the efficiency of the tube. See more at suppressor.

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