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A pentode transistor is any transistor having five active terminals.

Early pentode transistors

One early pentode transistor was developed in the early 1950s as an improvement over the point-contact transistor.
*A point-contact transistor having three emitters. It became obsolete in the middle 1950s.Pentode field-effect transistors having 3 gates, similar to vacuum tube pentodes have also been described

Modern pentode transistors

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