beam-power tube

American

[beem-pau-er] / ˈbimˌpaʊ ər /

noun

Radio.

a vacuum tube in which the stream of electrons flowing to the plate is focused by the action of a set of auxiliary, charged elements, giving an increase in output power.

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023