An audion receiver makes use of a single vacuum tube or transistor to detect and amplify signals. It is so called because it originally used the audion tube as the active element. Unlike a crystal detector or Fleming valve detector, the audion provided amplification of the signal as well as detection. The audion was invented by Lee De Forest. In 1915 Edwin Armstrong developed an improved "regenerative" form of audion receiver that used the same vacuum tube for RF amplification, RF detection, and audio amplification.
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