A low impedance field effect transistor

A junction field effect transistor having non-saturation characteristics like a vacuum tride has been successfully developed. Its output impedance can be decreased to 8 ohms so that it will serve in audio applications or as an impedance transformer. The geometrical structure of this FET is analogous to that of a triode tube and is based on the idea of controlling the resistance between drain and source by a potential applied to a grid-like gate structure. Design considerations that avoid saturation of the drain current will be discussed.