Antique radios, Old Time Radios
K40N
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Country:
Great Britain (UK)
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| Identical to |
K40N
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| Similar
Tubes |
Normally replaceable-slightly different:
B255
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| First Source
(s) |
22.Nov.1935 : Wireless World (The), London (WW, 79)
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| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Er)
Top contact with a cap.
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 2 Volts / If 0.18 Ampere / Direct |
| Description |
This is a variable mu tube.
|
| Information source |
History of the British Radio Valve to 1940 p. 146
Babani, International Radio Tube Encyclopaedia p. 112 & 113
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49
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K40N: Telefunken Werkstattbuch
Wolfgang Bauer
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Just Qvigstad
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):5
Collection of
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