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ID = 15800
Brand: SFR (S.F.R.) - Société Française Radio-Électrique; Paris
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to E175A
Similar Tubes
Normally replaceable-slightly different:
  3X75 ; EO75 ; TC1/75 ; TZ1-75

Base Jumbo 4-pin bayonet (1918) (Codex=Bz) 2 Top contacts.
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 1.2 Ampere / Direct / Specified voltage AC/DC

The E175A would be equivalent to the TZ1 / 75 Mullard according to the book Babani international radio tube encyclopedia and to the TC1 / 75 Philips according to the book universal vademecum.

Text in other languages (may differ)
Information source Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia   p. 198 & 199

jumbo_2_tc~~3.png E175A: Fin Stewart
Fin Stewart

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