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A4DD

Information - Help 
ID = 6555
       
Country:
Spain
Brand: Castilla; Madrid
Tube type:  Double Diode   Detector 
Identical to A4DD = AB1

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Fc)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.65 Ampere / Indirect / Specified voltage AC/DC
Information source Taschenbuch zum Röhren-Codex 1948/49   
 
a4dd_1.jpeg
A4DD: Photo of tube from my collection - TS
Tomasz Szczesniak

 
a4dd_so.png
A4DD: rtt
Michael Schlör

 

from Just Qvigstad

Usage in Models 1= 1934 ; 1= 1935

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):2


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