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ID = 71233
United States of America (USA)
Brand: General Electric for Brand RCA-Radiotron; Bridgeport CT, Syracuse NY
Developer: General Electric for Brand RCA-Radiotron; Bridgeport CT, Syracuse NY 
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 extraordinarily rare. Production was less than 100 items. ****
Identical to UV199_prototype
Successor Tubes 1922   UV199   UX199  

Base No base Wires only.
Was used by Radio/TV-reception etc.
Filament Vf 3 Volts / If 0.135 Ampere / Direct / Battery =

Early in 1921 developmental work was done in the GE Research laboratories at Harrison, New Jersey on a tube which would be small in size and having a low filament current. The tube was double ended, with no bases. Connecting wires were of stubby copper extending about 5 mm from the glass. The filament connections were at each end and anode and grid from the opposite ends, each about 5 mm from the filament wire.. The tube was manufactured in a very limited quantity but was designed for use in a portable radio designed by GE. In December 1921 the filament wire was reduced in width to .6 mm (from .9 mm), which produced a current of .06 amps.In May 1922 the tube was redesigned to have the 4 pin UV199 base.

Information source -- Collector info (Sammler)   
-- Original-techn. papers.   



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