From the cover: "A carefully followed program of filament voltage management can substanitally increase the life expectancy of transmitter power grid tubes. With today's rising operating costs, such a program makes good financial sense."
Reprint of the original RCA manual from 1959. Includes Electrons, Electrodes, and Electron Tubes. Paperback version with 384 pages of data and technical specifications on RCA tubes. Includes tube applications and installations.