Automatic Compensation for Class B Bias and Plate Voltage Regulation

A method of automatically compensating for the effects of bias and plate-voltage regulation in class B stages is outlined. It obviates the necessity of using heavy current bleeders where rectifier bias supply is used, and is shown to be more desirable than battery bias. A typical installation using low power tubes is described, but the principle may be applied to an installation of any desired power. It is shown further that such a system imposes less severe requirements on the plate supply as regards regulation. The only sacrifice entailed is a slight reduction in peak power output due to reduction in supply voltage on modulation peaks.