De Forest invented the Audion (see photo below), the first effective device for electrical amplification, which became the standard radio tube. It was a triode ... He had invented a detector circuit ...

Keywords vacuum tube, triode, amplification, radio frequency, communication devices, electron flow, grid control, detector, transmission station, electrical circuits Email us at footage@avgeeks ...

It’s a companion to his recent “spy transmitter,” a two-tube radio built in — or on ... with one tube each devoted to the RF amp, detector/mixer, and audio amplifier stages.