This work is an addition to a previous AES preprint (4643), where a new generalised push-pull tube amplifier topology was introduced, allowing an easy evaluation of maximum output power, optimal primary impedance of the output transformer and the damping factor, by a direct simulation of equations on a computer. But direct simulation is not always the right tool to use when accurate informations have to be derived at small input signal. Then the appropriate tool is a systematic use of Taylor's expansions. The aim of this paper is to show how to determine these expansions and which new results and insights can be derived from them, like new stability criteria, output impedance variations, harmonic distortions and effective voltage gains.
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