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I-T-E-V

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ID = 28640
       
 
   
Tube type:  Triode, vacuum   Universal 
  <1925 extraordinarily rare. Production was less than 100 items. ****
Identical to I-T-E-V
First year Mar.1921 70 Years of Radiotubes and V.
Successor Tubes 1921   RMR  

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 3.5 Volts / Direct / Parallel, (AC/DC)
Description Made by H W Sullivan. Known as "The Improved Three Electrode Valve" - no type number. Made to the R pattern during 1921. Superceded probably because of patent infringement action. With 50V on anode Ia = 1.5mA at Vg=0. Stokes - p 208. 
Literature 70 Years of Radiotubes and V.   
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