A beam tetrode, sometimes called a "beam power tube", is a type of tetrode valve (or 'tube') with auxiliary beam-focusing plates designed to augment power-handling capability and help reduce unwanted emission effects. These tubes are usually used for power amplification, especially at audio-frequency.
Read more about Beam Tetrode: History
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“What do we plant when we plant the tree?
We plant the ship that will cross the sea,
We plant the mast to carry the sails,
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We plant the ship when we plant the tree.”
—Henry Abbey (1842–1911)