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Which device was used for the amplification of audio signals before the invention of power amplifiers?(a) Diode(b) Op-amp(c) Vacuum tubes(d) SCRI had been asked this question during an interview for a job.I want to ask this question from Features of Power Amplifier topic in section Power Amplifier of Analog Circuits |
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Answer» The correct ANSWER is (c) Vacuum tubes |
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