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ID = 24231
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Ballast Tube (neither FeH or Urdox)   Power-supply 
Identical to K49D

Base Octal (Int.Octal, IO) K8A, USA 1935
Was used by Radio/TV-reception etc.
Filament If 0.3 Ampere / Specified current AC/DC ~ = (Series working)

used in 110V AC-DC Sets

Information source Ballast Tube Handbook, The   

K49D: Schaltplan auf
Peter Kahlich

ballast_k49d_sockel.png K49D: Eigene Sammlung
Peter Kahlich

Just Qvigstad
K49D: Valve Radio and Audio Repair Handbook - Charles E. Miller - Google Books
Peter Kahlich

More ...
Usage in Models 3= 1937? ; 2= 1937 ; 2= 1940?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):7

Collection of



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