Abstract :
The development, by the author, of amplifying tubes utilizing secondary emission is discussed. Various designs are shown, including the latest type which is described as possessing the quality of small dimensions, high sensitivity (10-100 amperes per lumen), high over-all amplification (106), high voltage output, minimization of noise, absence of microphonics. The characteristics of these tubes are mentioned and their application for such use as television and talking pictures are included.
