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ID = 17911
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: National Union Radio Corp.; Orange (NJ) 
Tube type:  Ballast Tube (neither FeH or Urdox)   Power-supply 
Identical to 1G1
Similar Tubes
Normally replaceable-slightly different:
First Source (s)
09.Jul.1935 : Electron Tube Registration List

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=B)
Was used by Radio/TV-reception etc.

Ballast tube for 2 V battery operated tubes. 2.2 to 3.2 V input, 0.7 V drop at 420 milliamps.

Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
1G1: aus ebay, Verkäufer sx28
Gottfried Silberhorn

1G1: Telefunken Werkstattbuch
Wolfgang Bauer

1G1: Sylvania Technical manual
Anonymous 413 Collector

from Just Qvigstad

Usage in Models 9= 1935? ; 2= 1935 ; 10= 1936 ; 1= 1940?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):22

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