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251_Ballast

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

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament If 0.25 Ampere
Description

This tube listed as being made by MOV - UK. Babani, Rohren Codex 1950 and British Radio Valves The Classic Years; 1926 - 1946; Supplement, p. 156.

 
Text in other languages (may differ)
Information source Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia   p. 313
Ballast Tube Handbook, The
Röhrencodex , Röhren-Taschenbuch 1950 23000 Röhren


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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