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ID = 30338
Brand: Thermion; Netherlands
Developer: Thermion; Netherlands 
Tube type:  Vacuum Pentode   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to IT103
Similar Tubes
Heater different:
  C443 ; RES374
Production stop Feb.1938

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928
Filament Vf 4 Volts / If 1.1 Ampere / Half indirect / Specified voltage AC/DC
Description This is a Thermiode, a glass tube in a shielding of nickel-iron alloy to prevent electric or magnetic interference. To avoid the Philips penthode patent (suppressor grid connected to the filament/cathode), Tungsram, Radio Record, Marathon, Longlife and others called this kind of tubes a tetrode with penthode characteristics. In fact was the suppressor grid connected to the grid. Nevertheless, this IT103 was a plug-in replacement for the C443 etc. 
Information source Universal Vade-Mecum, Electron Valves and Semiconductor Devices   group 207
- - Manufacturers Literature   1933
Peter den Boer

IT103: own collection
Peter den Boer

from Just Qvigstad

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