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ID = 28551
Brand: La Radiotechnique (RT); Paris, Suresnes
Tube type:  Transmitting Triode, air cooled 
  Ca. 1925 up to 1945 rare.
Identical to E52 = TM15 = E.52_SFR
First year 1923 ?? Saga of the Vacuumtube, Tyne page 408

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 5.3 Volts / If 1.4 Ampere / Direct / Battery =

Small transmitting triode 5 Watt. The brand is Radiotechnique.

Dimensions (WHD)
incl. pins / tip
55 x 120 x mm / 2.17 x 4.72 x inch
Literature - - Manufacturers Literature   1925
E52: own collection
Peter den Boer

E52: own collection
Peter den Boer

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