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VR21

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ID = 14966
       
Country:
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Triode, vacuum   Universal 
Identical to VR21 = 210LF = CV1021 = 10E/7738 = 210LF_Cossor

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
Filament Vf 2 Volts / If 0.1 Ampere / Direct / Battery =
Description This is the earlier name for the CV1021. and is also known as 10E/7738. Va<150. Typ Gm= 1.4mA/V at Ia=4.5mA, Va=125, -Vg=3. 
Literature Taschenbuch zum Röhren-Codex 1948/49   
-- Original-techn. papers.   
 
vr21_1.jpg
VR21: RFJ
Roy Johnson

 
1_238.png
VR21: Datenblatt
Wolfgang Bauer

 

Usage in Models 1= 1935 ; 1= 1937 ; 1= 1942 ; 1= 1950??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):4


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