Antique radios, Old Time Radios
VT31B_GPO
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Country:
Great Britain (UK)
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| Identical to |
VT31B_GPO
= CV1639
= 4101E
= 3A/141A
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| Similar
Tubes |
Other class quality (otherwise equal):
3A/141AY
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| Base |
UV-Base (4 Pins+Bayonet, USA 1914 WE)
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| Was used by |
Telephony |
| Filament |
Vf 4.5 Volts / If 1 Ampere / Direct / Specified voltage AND current AC/DC |
| Description |
Tube first made for the British Post Office in 1925 and used in telephony as a repeater tube.
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| Information source |
-- Original-techn. papers.
Babani, International Radio Tube Encyclopaedia
British Radio Valves - The Vintage Years: 1904-1925
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Just Qvigstad
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