Antique radios, Old Time Radios
Audion_04-triode
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Country:
United States of America (USA)
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| Identical to |
Audion_04-triode
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| Base |
Edison (candelabra) 12 mm
2 Sidecontacts.
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 6 Volts / Direct / Battery = |
| Description |
Following experiments with the Audion_02 and _03, de Forest realised that the tube would work better if the second electrode was placed between the filament and anode. It could not be a "plate" as this would block emissions, so he ordered some tubes from H. W. McCandless and Co on November 25th, 1906, which employed the new feature of a wire bent into a zig-zag or grid form. The tube had the T8 (25mm) bulb and an E12 Edison screw base, with the anode and "grid" (as he named it) coming from opposite sides of the bulb, adjacent to the top of the anode and grid. A patent was applied for on this tube on January 29th, 1907 and patent no 879532 was granted on February 18, 1908. This tube's performance was a great improvement on the earlier types. The first public announcement of the three electrode triode Audion was at the Brooklyn Institute of Arts and Sciences on March 14th 1907. de Forest immediately reorganized his company into two concerns: 1) the de Forest Radio Telephone company and a subsidiary the Radio Telephone Company. These were formed to manufacture and market wireless apparatus on which he owned or controlled patent rights. Immediately following this, McCandless was instructed to manufacture the new Audions for commercial use. The first of these tubes had a single carbon filament. Later tubes made in 1906 had double filaments but the reference material does not say what was used for these filaments. It is possible they were tantalum as McCandless was experimenting with this metal at the time.
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Dimensions (WHD)
incl. pins / tip |
x x 25 mm / x x 0.98 inch |
| Information source |
Saga of the Vacuum Tube, Tyne Pages 61 & 64
Radio Craft January 1947, page 27
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Audion_04-triode: saga of theVacuum Tube page 62
Fin Stewart
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