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beam-power tube

[ beem-pou-er ]
/ ˈbimˌpaʊ ər /
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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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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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