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Which of the power amplifiers is not suitable as audio amplifiers?

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Which of the power amplifiers is not suitable as audio amplifiers?

(a) Class A

(b) Class B

(c) Class C

(d) Class D

I have been asked this question in examination.

The question is from Classification of Output Stages topic in chapter Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Right answer is (c) Class C

Easiest explanation: The transistor biasing gives a much improved efficiency of around 80% to the class C amplifier, it introduces a very heavy distortion of the output signal. Therefore, class C amplifiers are not suitable for use as audio amplifiers.

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