Antique radios, Old Time Radios
T3_Osram
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Country:
Great Britain (UK)
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| Identical to |
T3_Osram
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| First year |
Feb.1917
British Radio Valves - The Vintage Years: 1904-1925
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| Base |
Wires
Wires only.
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| Was used by |
Military and/or Government |
| Filament |
Vf 17.5 Volts / If 5.4 Ampere / Direct / Specified voltage AC/DC |
| Description |
350 W at 5000 V.
One of the first group of high vacuum power valves developed by the UK Navy's Signal Reserach Group. Known by the British Navy as NT3. First made by Osram Lamp Works February 1917.
At an exhibition in London in 1920, the heater rating was given as 18V, 3.4A and an output power of 330W. (Vyse & Jessop). Normally made with wires - two at one end for the filament and one at the other ensd for the anode. The grid was connected to a cap on the side of the tube. Also made with bayonet B22 base at each end - extremely rare.
Text in other
languages (may
differ)
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Dimensions (WHD)
incl. pins / tip |
x 305 x 150 mm / x 12.01 x 5.91 inch |
| Weight |
431 g / 15.20 oz |
| Information source |
Saga of the Vacuum Tube, Tyne page 228-230
British Radio Valves - The Vintage Years: 1904-1925
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Collection of
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