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ID = 13389
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to 11A2

Base British-7-Pin, old (M7A) (Codex=Nb) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Battery =

Marketed under the Micromesh brand.

Va <200; Ia 3mA for Vg=-2; gm=2.8mA/V, Ra=18k.

Information source Babani, International Radio Tube Encyclopaedia   p. 18 & 19
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Section 292, p. 656
Taschenbuch zum Röhren-Codex 1948/49

154.png 11A2: Telefunken Werkstattbuch
Wolfgang Bauer

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Just Qvigstad
11A2: Brimar Radio Valves 1936
Adrian Riesen

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Usage in Models 4= 1933 ; 1= 1934

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):5


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