Quasi Transients in Class B Audio-Frequency Push-Pull Amplifiers

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Abstract
Although class B audio-frequeny amplifiers have been analyzed by many previous investigators, the effect of the leakage inductance of the output transformer or choke in producing quasi transients, i.e., exponential terms which recur periodically, has passed unnoticed. This paper gives equations for determining these quasi transients in the wave forms of the plate voltage, the plate current, and the output current, when the amplifier has reached a permanent state. The theoretical relations are derived from fundamental relations involving the tube characteristic, which is assumed to be linear, and the circuit external to the tubes. An equivalent circuit based on three-circuit transformer theory is also given to show the physical significance of the different terms in the equations. Cathode-ray oscillograms are presented in support of the theoretically calculated curves.

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