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ID = 20629
Great Britain (UK)
Brand: Brimar (STC); Foots Cray
Developer: Standard Telephones and Cables Ltd. (STC); London, Foots Cray 
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
  Ca. 1925 up to 1945 rare.
Identical to 9A1_5pin = VT126 = CV1690
Similar Tubes
Other base:

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC

Marketed under the Micromesh label. Variable mu tube.

Va <250, Vs <100; gm =4.25mA/V at Ia=5mA.

Information source Wireless World (The), London (WW, 79)   Data Nov 1936
Babani, International Radio Tube Encyclopaedia   Pages 16 & 17
History of the British Radio Valve to 1940
Universal Vade-Mecum, Electron Valves and Semiconductor Devices

9a1_5_1.png 9A1_5pin: Manufacturer's Literature
Emilio Ciardiello

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9A1_5pin: Brimar Radio Valves 1936
Adrian Riesen

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