tetrode

(tetrōd′)

noun

an electron tube that has four electrodes (a cathode, anode, and two grids), used to generate, amplify, modulate, or demodulate electrical signals

Origin: tetr(a)- + -ode

See tetrode in American Heritage Dictionary 4

noun
A four-element electron tube containing an anode, cathode, control grid, and additional electrode.

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tetrode

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