Catalogue de radios anciennes
VT25_GPO
| Culot |
UV-Base (4 Pins+Bayonet, USA 1914 WE)
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| Utilisé par |
Téléphonie |
| Chauffage |
Vf 4.5 Volt / If 0.82 Ampère / Direct / Battery = |
| Description |
The telephone network in Great Britain continued to grow. By 1926 there were twenty-six repeater stations with total of 670 repeaters in service. One of the standard amplifying valve used in such repeaters, designed by the Post Office as "Valve Thermionic (VT) No. 25. It was made by General Electric Company Ltd., London and was a further development of the R valve used in radio applications. It was used in radio receivers as an output valve under the designation LS5. Early versions of this tube (page 368, Tyne) show a tipped tube with what would be an American "Shaw" base. The tubes did use genuine "Shaw" bases imported to the UK by the MOV Works and these are actually branded "Shaw". Later tipless versions of the VT 25 had a polished nickel plated Shaw style of base but it is not known if these were American made or made by MOV. Filament voltage 4.5, folament current .82 amps.
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Dimensions
(l x h x p)
incl.pins/tip |
x 125 x 57 mm / x 4.92 x 2.24 inch |
| Poids |
54 g / 1.90 oz |
| Bibliographie |
Saga of the Vacuum Tube, Tyne page 367, 368
British Radio Valves - The Vintage Years: 1904-1925 pages 84 and 133
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Just Qvigstad
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Collection de
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Contributions forum pour ce composant
VT25_GPO
Discussions: 1 | Publications: 1
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VT25_GPO (VT25_GPO)
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Fin Stewart
07.May.12
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1
The original version of the VT25 had an American made "Shaw" Navy metal shell UV base with the Shaw logo of an "S " inside a diamond stamped into the base within the pin area. These tubes were tipped. Later tipless versions, c. 1930, had a metal shell Shaw base which was polished nickel plated. The VT39 and VT40 tubes, similar to the later VT25 were also fitted with the polished Shaw base.
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VT25_GPO
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