An Analysis of Two Triode Circuits

Two typical triode circuits, used for obtaining regeneration by mutual induction, are examined analytically, with the idea of testing the results of the analysis by experiment. As the experiments were to be performed with a one thousand cycle current (because of the greater accuracy of measurement at this frequency) it was permissible to neglect the condensive coupling due to the tube elements, and furthermore, as the conditions for the starting of oscillations were to be determined, the current taken by the grid could be neglected as it is only one or two microamperes in the non-oscillatory state. Measurements made on the circuits, by using the alternating current bridge, confirm the theoretically derived relations to a remarkable degree of precision, showing that triode circuits are susceptible of accurate analysis.