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A New Type of Practical Distortion Meter

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1 Author(s)
Hayes, J.E. ; Transmission and Development Department, Canadian Broadcasting Corporation, Montreal, Que., Canada

This paper gives a description of a distortion meter embodying circuits which differ somewhat from the types previously employed for this type of instrument. It consists essentially of a bridged-T audio-frequency bridge circuit, in which the inductance element is replaced by a reactance-tube circuit. Because of the flexibility obtainable in vacuum-tube circuits, it is a relatively simple matter to vary the effective inductance continuously over a fairly wide range, and thus allow the distortion meter to be used at any frequency in the audio range. Certain precautions must be taken in a circuit of this type in order to avoid difficulties due to nonlinear action of the reactance-tube circuit. Application of negative feedback to the reactance-tube circuit effectively reduces the nonlinearity, increases stability, and at the same time keeps tube noise and hum at a minimum level. An analysis of the reactance part of this circuit, together with formulas for calculating the effective Q and the optimum operating conditions are included. Although the study of the properties of the reactance-tube circuit with negative feedback was limited to features applicable to the problem at hand, some of the information obtained may be of use in other fields.

Published in:

Proceedings of the IRE  (Volume:31 ,  Issue: 3 )