Abstract :
This article traces the evolution of vacuum tubes (thermionic valves) from their origins in incandescent filament lamps. It details the use of diodes and triodes in early radio transmission and detection, being the building blocks of rectifiers, amplifiers and oscillators. It also mentions the later developments of tetrodes and pentodes and concludes that the end of the vacuum tube era began with the introduction of the point contact transistor.
Keywords :
filament lamps; radiofrequency amplifiers; radiofrequency oscillators; rectifier tubes; transceivers; transistors; vacuum tubes; amplifiers; diodes; incandescent filament lamps; oscillators; pentodes; point contact transistor; radio detection; radio transmission; rectifiers; tetrodes; thermionic valves; triodes; vacuum tubes;
