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A20B

Information - Help 
ID = 6556
       
Country:
Great Britain (UK)
Brand: Ever Ready Co. (GB) Ltd.; London
Tube type:  Double Diode 
Identical to A20B
Similar Tubes
Normally replaceable-slightly different:
  2D4A

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Fc)
Filament Vf 4 Volts / If 0.65 Ampere / Indirect / Parallel, (AC/DC defined voltage)
Information source Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia   
 
a20b.jpg
A20B: own collection
John Koster

 
19_3.png
A20B: Telefunken Werkstattbuch
Wolfgang Bauer

 

from Just Qvigstad

Usage in Models 9= 1935 ; 4= 1936 ; 1= 1937? ; 2= 1937

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):16


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