The variation in output impedance of triodes and to some extent pentodes as a function of instantaneous current leads to a type of distortion not usually taken into consideration. The detailed evaluation of the characteristics at the extremes of current excursion indicate the source of a distortion that is both a function of frequency and amplitude for a given circuit design. Set forth are the means by which the effects of this nonlinear behavior may be computed and avoided within the limits specified for the circuit's behavior.
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