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ID = 25444
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  LOCKED OFF PART (CODE 9) - see in Notes 
Identical to UX-199_code9 = 99 = B_CommontypeUSA_Trio = CX299 = X99 = UX99 = UX199
Similar Tubes
Other characteristic (electr. data):
Other base:
  C299 ; UV99
First year Apr.1925 Saga of the Vacuum Tube, Tyne page 314
Production stop 1931

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Description Direct heated 3,3-V-Triode for dry batteries: UX199 = CX299 = X99. Nickel-plated contact pins were introduced in 1927 [Tyne 314]. 
Text in other languages (may differ)
Information source -- Collector info (Sammler)   
Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia

ux199~~4.gif UX-199_code9: KoBi
Konrad Birkner † 12.08.2014

Just Qvigstad

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