Radio Antica e Radio d'epoca
A_Moorhead-spherical
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Stato:
USA (Stati Uniti d'America)
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| Identico a |
A_Moorhead-spherical
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| Valvole
simili |
Other shape (e.g. bulb type):
A_Moorhead
Sostituita normalmente - piccola diff.:
SE-1444_Moorhead
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| Prime serie |
1919
Saga of the Vacuum Tube, Tyne page 172.
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| Zoccolo |
UV-Base (4 Pins+Bayonet, USA 1914 WE)
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| Utilizzata per |
Radio/TV-reception etc. |
| Filamento |
Vf 4 Volt / If 0.7 Ampere / Direct / Battery = |
| Descrizione |
Moorhead/Marconi/DF Type A: The Type A is a hard tube also known as the Marconi VT Class II. Some have Class II marked on the base rather than A on the bulb. See also the cylindrical version. Tyne does not publish about this spherical version. But Tyne describes the cylindrical version: drawn tungsten wire filament, the eleven-turn spiral of nickel-wire-grid and the nickel sheet plate, rolled into a cylinder about 3/4 inch in diameter. It operates for 60 to 90 volts. Technically it is more or less a SE-1444. See also type B, C, D, E, F and G. See Tyne page 172 and 173.
Family - according to Tyne:
Type A is similar to SE-1444, also with hard vacuum for amplification. Type B is a similar tube, but with a low vacuum for operation as a detector with 18-40 volts on the anode. Type C is similar to Type A, except that the grid is constructed of 22 turns of molybdenum wire with a pitch of 0.3 inch, instead of nickel - and for anode voltages of 80 - 500 volts. Type D is the unbased Electron Relay (ER) previously made by Moorhead. Type E is the British standard Type R, similar to Type A, but with spherical bulb and European standard four-pin base. Type F is similar to Type E, but with a low vacuum like the Type B. Type G is similar to Type C, but has a spherical bulb and an European standard four-pin base. It is the same as the British standard Type B tube.
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A_Moorhead-spherical: own collection
Peter den Boer † 2025
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Just Qvigstad
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