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ID = 65364
Great Britain (UK)
Brand: British Tungsram Radio Works Ltd.
Developer: British Tungsram Radio Works Ltd. 
Tube type:  Signal Diode - one single system   Detector 
  Ca. 1925 up to 1945 very rare. ***
Identical to CV1687 = D418 = VT118B_GPO
Similar Tubes
Other characteristic (electr. data):
  CV1686 ; VT118A_GPO

Base Europe 3-Pin B3 (Eu H) Top contact with a cap.
Was used by Military and/or Government
Filament Vf 4 Volts / If 0.18 Ampere / Indirect / Specified voltage AND current AC/DC

Tube used as a detector, rectifier and output. No grid pin

The CV1686 and CV1687 are selected versions of the D418. They differ in anode impedance, the CV1686 has an impedance range of 2250 to 3000 ohms; the CV1687 a range of 3000 to 3750 ohms.

Information source Babani, International Radio Tube Encyclopaedia   Pages 78 & 79
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Page 36
CV1687: Fin Stewart
Fin Stewart


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