Abstract
Audion as an amplifier of radio signals, whether telegraphic or telephone, was far ahead of any other amplifier that has ever been developed. For several years, from 1907 to 1911, audion was used only as a sensitive detector for receiving radio signals. The general principles of his work were not understood. De Forest conducted some experimental work on the use of an audion amplifier as a telephone repeater, however, his early development was unsuccessful. This was due to the fact that he did not attach much importance to the amount of displacement on the grid of the audion. He tried to amplify a low-frequency signal (AF) with an offset value on a grid designed to amplify a high-frequency signal (RF). In 1912, the first sound amplifier was built by Fritz Lowenstein, a former employee of the Forest company.
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