Abstract
A number of balanced, single‐tube, direct‐current amplifier circuits are compared, which are applicable to the four‐element, low grid‐current vacuum tube. The balance equations are stated for the most generally useful circuit, and magnitudes of the tube characteristics involved are given for the Western Electric No. D‐96475 Tube. Experimentally determined values of circuit constants observed under balance conditions are also given. The stability of the circuit is discussed, and a convenient procedure for obtaining a balance by experimental methods is suggested.

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