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251_Ballast

Information - Help 
ID = 21316
       
Country:
Germany
Brand: Osram GmbH KG; Berlin
Tube type:  Current Regulator, Iron in Hydrogen 
Identical to 251_Ballast = 1934

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament
Description

60...180V; 250mA.

 
Information source Taschenbuch zum Röhren-Codex 1948/49   
Röhren-Taschenbuch (frühe Ausgaben, spätere siehe andere Einträge)   
Ballast Tube Handbook, The
 

from Just Qvigstad

Usage in Models 8= 1931 ; 20= 1932 ; 3= 1933

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):31

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