Optimum Operating Conditions for Class C Amplifiers

A theoretical analysis of the plate efficiency and output of a triode operating as a class C amplifier is made. A linear amplifier with any desired operating angle is described. Three cases in the operation of a triode as a class C amplifier are analyzed for the load impedance which will give maximum output. It is shown that for a given tube, plate voltage, and plate loss, there is a definite value of load impedance, C bias, and grid excitation voltage, which will give maximum output. A rapid method of determining these optimum operating conditions is shown and checked experimentally.