The characteristics of the common-base, common-emitter, and common-collector circuits are analyzed for their advantages and disadvantages for audio work. Bias stabilization, crossover distortion, and harmonic distortion are discussed for several circuits, and the basic design procedures are outlined. Transistors approach a theoretical amplifier much more closely than do vacuum tubes, so that it is reasonable to expect that cirucit development will enable the transistor to approach and ultimately surpass the performance of vacuum tubes at a power-supply efficiency unattainable with tubes.
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