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HD21

Information - Help 
ID = 14283
       
Country:
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Double Diode-Triode 
Identical to HD21

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Fp)
Filament Vf 2 Volts / If 0.1 Ampere
Information source Taschenbuch zum Röhren-Codex 1948/49   
 
hd21.jpg
HD21: Used valve from my collection.
Gil Silva

More ...
 
hd21_sock.png
HD21: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

 

from Just Qvigstad

Usage in Models 5= 1934 ; 2= 1935 ; 2= 1936

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):9


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