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Pentode transistor : ウィキペディア英語版 | Pentode transistor 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〔(US Patent 4,104,673 August 1,1978 )〕
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