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U21

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ID = 8263
       
Country:
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Tube type:  Half-Wave Vacuum Rectifier 
Identical to U21 = 10E/53 = CV3751

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Em)
Filament Vf 2 Volts / If 1.8 Ampere
Information source Taschenbuch zum Röhren-Codex 1948/49   

u21_so.png U21: rtt
Anonymous 10 Collector

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Just Qvigstad
u21_techdat1.png
U21: Original Data Sheet
Hermann Fleischanderl

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Usage in Models 2= 1938 ; 1= 1939? ; 1= 1939

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

Collection of

 
20200616_210416.jpg

U21
 

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