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Push-pull audio amplifier theory

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1 Author(s)
Melehy, M. ; Michigan State Univ., East Lansing, Mich.

Assuming nonlinear tube characteristics, this paper presents: 1) a single mathematical analysis of instantaneous relations applicable to all classes of operation of push-pull audio vacuum tube amplifiers; 2) a mathematical derivation, applicable to all classes of operation, of the composite load line equation and a study of the amplifier frequency response both at medium and low frequencies, with third and higher odd-order effects neglected at low frequencies; 3) an analytical method for finding the maximum magnitude of class AB1and AB2grid bias beyond which appreciable non-linear distortion occurs; and 4) a single general condition for matching the load to the tubes irrespective of the class of operation, and the interpretation of this condition for each case.

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Audio, IRE Transactions on  (Volume:AU-5 ,  Issue: 4 )