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ID = 30334
Brand: Thermion; Netherlands
Tube type:  Vacuum Pentode   Power/Output 
  Ca. 1925 up to 1945 very rare. ***
Identical to IP3
Similar Tubes
Multiple differences or of other kind:
  C443 ; RES364

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928
Filament Vf 4 Volts / If 1 Ampere / Half indirect / Specified voltage AC/DC
Description 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 IP3 was a plug-in replacement for the C443 etc. 
Information source Universal Vade-Mecum, Electron Valves and Semiconductor Devices   group 205
- - Manufacturers Literature   1932
IP3: Private collection
John Eekels

Peter den Boer

IP3: own collection
Peter den Boer

from Just Qvigstad

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