pentode: see electron tube electron tube, device consisting of a sealed enclosure in which electrons flow between electrodes separated either by a vacuum (in a vacuum tube) or by an ionized gas at low pressure (in a gas tube).
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pentode
A type of vacuum tube used in high-end audio preamplifiers, ham radios and a variety of other electronic circuits. A pentode is like a tetrode with the addition of a "suppressor grid" between the screen grid and the plate. Typically biased at or near the cathode voltage, the suppressor grid provides additional isolation between the control grid and plate. See tetrode, triode and diode.
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| The Pentode Uses Three Grids |
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| In a pentode, the addition of a screen grid and suppressor grid between the control grid and plate controls feedback and oscillation. |
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