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1. In which decade were the first successful diode and triode vacuum tubes invented?





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  • By: guest on 02 Jun 2017 01.22 am
    In 1904, John Ambrose Fleming invented the first practical electron tube called the 'Fleming Valve', which is a diode rectifier. In 1906, Lee de Forest invented the audion later called the triode, which provided signal amplification.
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