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ID = 33192
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 VT126 = 9A1_5pin = CV1690 = 9A1
Similar Tubes
Multiple differences or of other kind:

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

4.25mA/V Gm, 250V max anode. Variable mu tube.

Information source -- Original-techn. papers.   p.
-- Collector info (Sammler)   

9a1_5_1~~1.png VT126: Fin Stewart
Fin Stewart

Just Qvigstad
Usage in Models 1= 1929

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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