Radio Antica e Radio d'epoca
VT68_GPO
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Stato:
Gran Bretagna (Regno Unito)
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| Identico a |
VT68_GPO
= CV1651
= G445B
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| Zoccolo |
Europe 4-Pin B4 (Eu A, E, 4A) 1914
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| Utilizzata per |
Telephony |
| Filamento |
Vf 4 Volt / If 0.45 Ampere / Direct / Specified voltage AC/DC |
| Descrizione |
The first VT68 was developed for the U.K.'s Post Office by Marconi-Osram as the G445B. This was a long life tube with a more robust and lower power filament than the LS(5B). The nickel ribbon filament operated at 1.8W compared with 4.2W for the LS type used in the line amplifiers.
The tube was subsequently incorporated in the CV1651 specification and was manufactured until about 1945 by other companies as the tubes were still required for telephony amplifiers.
The shape of the later tubes differs from the initial balloon shape of the early tubes.
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| Bibliografia |
- - Manufacturers Literature
The Saga of Marconi Osram Valve Pages 136 & 137
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VT68_GPO: Fin Stewart
Fin Stewart
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Just Qvigstad
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