File:De Forest RJ6 Audion radio receiver.jpg
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![File:De Forest RJ6 Audion radio receiver.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/De_Forest_RJ6_Audion_radio_receiver.jpg/800px-De_Forest_RJ6_Audion_radio_receiver.jpg?20210502170543)
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[edit]DescriptionDe Forest RJ6 Audion radio receiver.jpg |
English: One of the first amplifying radio receivers, the De Forest Type RJ6 receiver made by the De Forest Radio Telephone and Telegraph Co., from an advertisement in a 1915 trade journal. It was a one-tube radio that used the Audion (triode), the first amplifiying vacuum tube, invented by Lee De Forest in 1906, both as a detector to rectify the radio signal, and as an audio amplifier. The Audion is mounted on the front panel so the operator can see if the filament is lit, and adjust the filament current by its brightness. The Audion is mounted upside down, with the delicate filament hanging down so it won't sag and touch the grid. The large dial on the right is the tuning, the multiposition switch in upper center adjusts the plate voltage, and the multiposition switch in lower center adjusts the filament current. The single Audion did not produce enough audio power to drive a loudspeaker, so the headphones at left are used for listening. The advertising copy surrounding the picture read: "AUDION RECEIVING CABINET TYPE RJ6 Incorporating the Famous De Forest Audion Detector, The Most Efficient Receiving Set For Experimental And General Purposes Ever Offered For Less Than $500" |
Date | |
Source | Downloaded 25 September 2013 from Proceedings of the IRE (Institute of Radio Engineers, New York), Vol. 3, No. 4, December 1915, page v on Google Books |
Author | Lee De Forest |
Other versions | DeForest RJ6 Receiving Set from the March 1916 QST.png has much lower resolution. |
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current | 17:05, 2 May 2021 | ![]() | 1,434 × 739 (173 KB) | Materialscientist (talk | contribs) | FFT |
11:33, 26 September 2013 | ![]() | 1,434 × 739 (98 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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