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ID = 32291
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to CV518 = ACVP1
Similar Tubes
Normally replaceable-slightly different:
  9A1 ; A50M ; MVS/Pen ; VP4

Base British-7-Pin, old (M7A) Top contact with a cap.
Was used by Military and/or Government
Filament Vf 4 Volts / If 0.65 Ampere / Indirect / Specified voltage AC/DC

The commercial name of the valve is written ACV/P1 but we stick to some rules for equality and write ACVP1

This tube is a variable mu type.

Information source Babani, International Radio Tube Encyclopaedia   p. 62 & 63
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   p. 32
Taschenbuch zum Röhren-Codex 1948/49

Just Qvigstad

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