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Applying voltage to the grid controlled the amount of a second current flowing across the tube. a vacuum tube device that could take a weak electrical signal and amplify it into a larger one. (A Science Odyssey: People and Discoveries, 1999). In 1913, AT&T installed audions to boost voice signals as they crossed the US continent...
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a vacuum tube device that could take a weak electrical signal and amplify it into a larger one. (A Science Odyssey: People and Discoveries, 1999). In 1913, AT&T installed audions to boost voice signals as they crossed the US continent. Soon the audion was being used in radios as well. In 1921, De Forest invented a way of recording sound on movies...
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