The indirectly-heated emitter employs an emitting cathode and a heater element. Thermal energy is conducted from the ... heated electron emitter, and the symbol used to denote it in schematic diagrams. Filaments are fabricated from tungstenanbsp;...
|Title||:||Unified concepts of electronics|
|Author||:||Clyde N. Herrick|
|Publisher||:||Prentice Hall - 1970|