A Method of Treating Resistance Stabilized Radio-Frequency Amplifying Circuits

An equation is developed showing the relation between the circuit constants and the critical resistance in a resistance stabilized amplifier having a tuned grid circuit and a pure inductance plate load. In the derivation of this equation it has been found necessary to assume the grid to filament capacity to be zero. Equations are given which may serve as a basis for approximation formulas which will take this capacity into account. The experimental results suggest a convenient method of measuring very small capacities, and demonstrate the possibility of controlling regeneration, in this type of circuit, by means of a small condenser between the grid and filament.