Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
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 B4 (Eu A, E, 4A) 1914
Filament Vf 3.5 Volts / Direct / Specified voltage 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 Superceded probably because of patent infringement action.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. 
Information source 70 Years of Radiotubes and V.   
- - -   
- - -
- - -

from Just Qvigstad

You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]