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Pen428

Information - Help 
ID = 11474
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Vacuum Pentode   Power/Output 
Identical to Pen428 = OP41

Base British-7-Pin, old (M7A) (Codex=Ndo)
Filament Vf 4 Volts / If 2.1 Ampere
Information source Taschenbuch zum Röhren-Codex 1948/49   

161_10.png Pen428: Telefunken Werkstattbuch
Wolfgang Bauer


Just Qvigstad
pen428_mullard_data_01.png
Pen428: Mullard-original papers
Bernd Staginnus

Usage in Models 2= 1937 ; 1= 1938

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):3
 

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