Chapter 6

The Power Amplifier

Publisher Summary

The task of a power amplifier is to amplify a processed signal and deliver power into a load such as a loudspeaker. It should do this without introducing spurious signals, such as hum, noise, oscillation, or audible distortion, while driving a wide range of loads. Additionally, it should be tolerant of abuse, such as open or short circuits. Valves designed specifically for audio use generally have optimized configurations that are detailed in the manufacturer’s data sheets. Designing output stages for audio valves from first principles is reinventing the wheel, but an overview of the practicalities is most useful; therefore, one will indulge in a brief analysis of a currently fashionable topology. ...

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