20 October 2010
The introduction of vacuum tubes in the early twentieth century led to the rapid growth of modern electronics. With these devices made possible the manipulation of signals, which could not be done in the old telegraph and telephone circuits, or with the first transmitters using high-voltage sparks to generate radio waves. For example, with vacuum tubes could amplify radio signals and sound weak, and also potentially overlapping audio signals to radio waves. The development of a wide variety of tubes, designed for specialized functions, enabled the rapid advancement of technology for communication radio before the Second World War, and the development of early computers, during the war and shortly afterwards.
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