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
Famous quotes containing the word beam:
“Why beholdest thou the mote that is in thy brother’s eye, but considerest not the beam that is in thine own eye?”
—Bible: New Testament Jesus, in Matthew, 7:3.
From the Sermon on the Mount.