Antique radios, Old Time Radios
T4A
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Country:
Great Britain (UK)
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| Identical to |
T4A
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| First year |
1918
Saga of the Vacuum Tube, Tyne page 230
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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 5.2 Ampere / Direct / Specified voltage AC/DC |
| Description |
GEC-Osram design for Navy. 450 Watt at 3-7 kV. First made by Osram lamp Works March 1918
In a 1920 exhibition of their tubes, MOV give the heater rating as 1V at 3.4A.
Text in other
languages (may
differ)
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Dimensions (WHD)
incl. pins / tip |
175 x 330 x mm / 6.89 x 12.99 x inch |
| Information source |
Saga of the Vacuum Tube, Tyne page 228-230
British Radio Valves - The Vintage Years: 1904-1925 Pages 128 & 130
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