Abstract
IN circuits containing balanced valves, as used in such applications as push-pull output stages or in d.c. amplifiers, it is customary to balance the valves by means of external circuit adjustments so that errors caused by differences in their characteristics are reduced. There are various methods of doing this1; but none of these gives compensation for all characteristics simultaneously, as it is possible to make adjustments to only one of the three properties, namely, zero balance (equality of static plate currents), stage gain and effect of changes of cathode-supply voltage.
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References
Verhagen, C. M., Proc. Inst. Rad. Eng., 41, 616 (1953).
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AITCHISON, R. A New Circuit for balancing the Characteristics of Pairs of Valves. Nature 174, 704 (1954). https://doi.org/10.1038/174704a0
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DOI: https://doi.org/10.1038/174704a0
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