thumb|upright|Graphic symbol representing a pentode of the indirectly heated cathode class Electrodes, listed from top to bottom: anode, suppressor grid, screen grid, control grid, cathode A pentode is an electronic device having five electrodes. The term most commonly applies to a three-grid amplifying vacuum tube or thermionic valve that was invented by Gilles Holst and Bernhard D.H. Tellegen in 1926. The pentode (called a triple-grid amplifier in some literature) was developed from the screen-grid tube or shield-grid tube (a type of tetrode tube) by the addition of a grid between the screen
五极管由屏极、抑制栅极、控制栅极、帘栅极、阴极五个电极组成。电流从屏极流入,阴极流出,其中电流由栅极控制,这与三极管完全一样。但五极管比电子三极管多了两个电极:帘栅极、抑制栅极。
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