Before revision: W. Amos, R. S. Amos, Newnes Dictionary of Electronics, 4th ed., London, U. K.: Newnes, 1999, p. 265, 269 E. Williams, Thermionic Valve Circuits, 4th ed., London: Sir Isacc Pitman & Sons, 1961, p. 151 Some of the output of the amplifying device is applied back to its input so as to add to the input signal, increasing the amplification.W.
After revision: W. Amos, R. S. Amos, Newnes Dictionary of Electronics, 4th ed., London, U. K.: Newnes, 1999, p. 265, 269 E. Williams, Thermionic Valve Circuits, 4th ed., London: Sir Isacc Pitman & Sons, 1961, p. 151 Some of the output of the amplifying device is applied back to its input to add to the input signal, increasing the amplification.W.