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tetrode transistor
A tetrode transistor is any transistor having four active terminals.
==Early tetrode transistors==
There were two types of tetrode transistor developed in the early 1950s as an improvement over the point-contact transistor and the later grown junction transistor and alloy junction transistor. Both offered much higher speed than earlier transistors.
*Point-contact transistor having two emitters. It became obsolete in the middle 1950s.
*Modified grown junction transistor or alloy junction transistor having two connections at opposite ends of the base. It achieved its high speed by reducing the input to output capacitance. It became obsolete in the early 1960s with the development of the diffusion transistor.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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