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ID = 33190
Great Britain (UK)
Brand: Brimar (STC); Foots Cray
Developer: Brimar (STC); Foots Cray 
Tube type:  Vacuum Pentode   RF/IF-Stage 
  Ca. 1925 up to 1945 very rare. ***
Identical to CV1690 = VT126 = 9A1_5pin = 9A1

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 Top contact with a cap.
Was used by Military and/or Government
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AND current AC/DC

4.25mA/V Gm, 250V max anode.

Information source Universal Vade-Mecum, Electron Valves and Semiconductor Devices   p. 78
Babani, International Radio Tube Encyclopaedia   Pages 78 & 79
-- Original-techn. papers.

9a1_5_1~~2.png CV1690: Fin Stewart
Fin Stewart

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