An Electronic Circuit Which Extracts Antilogarithms Directly

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Abstract
It has long been established that variable‐μ tubes of types such as the 6SK7 were capable of outputs which were proportional to the logarithm of the input over a specified range of bias voltages. The use of inverted triodes, and related circuits, is also widely known. It was decided to combine these two older techniques in the hope of developing a new one. Accordingly, a 6SK7 was hooked up as an inverted triode, i.e., the plate was used as the controlling element, and the control grid was employed as the output element; the results obtained with this arrangement were then plotted and investigated. As reported herein, a circuit capable of extracting antilogarithms over a fairly extended range of input voltages was developed.

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