High audio power from relatively small tubes

The author presents a method by which audio outputs five to ten times the usual output of a tube of a given size may be obtained with the same plate voltage, lower average plate dissipation, and no serious effects on the tube. The above results are obtained by using the tubes in such a manner that advantage is taken of the essential features of the class "B" amplifier. An amplifier of this type\´ was developed for use as a source of high audio power for plate modulation of a broadcast station and may be applied to any system requiring a relatively high audio output from a minimum of equipment. A discussion of the class "A" and class "B" amplifiers with diagrams illustrating the operation of each class will be given to set forth some of the essential operating features of these amplifiers.