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ID = 51756
Brand: Thermion; Netherlands
Developer: Thermion; Netherlands 
Tube type:  Triode, vacuum   Power/Output 
Identical to KI25/5
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Multiple differences or of other kind:
Production stop Feb.1938

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 7.5 Volts / If 1.2 Ampere
Description They were supplied with a half indirect kathode and B4 base as plug-in replacement for the Philips F704 and with a indirect kathode, connected to the sidecontact, also with B4 base. See pin assignments. 
Information source - - Manufacturers Literature   1933
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ki2554pinbase.png KI25/5
Peter den Boer

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