Pro Sound Web: A power amplifier is a device for making a larger, more powerful signal out of a small, weak signal.
It was on February 18, 1908 that Lee DeForest was granted U.S. Patent No. 879,532 titled “space telegraphy,” but in actuality, the patent was for a vacuum tube triode amplifier that DeForest called the “audion amplifier.” For the first time it was possible to amplify signals.
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