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ID = 49053
Brand: CSF, Compagnie Générale de TSF; Paris
Tube type:  Electrometer, Space Charge Grid 
Identical to BE2

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap.
Filament Vf 2.8 Volts / If 0.5 Ampere / Direct / Battery =

Electrometer tetrode with space charge grid for high impedance measurements ?

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
x 150 x 38 mm / x 5.91 x 1.50 inch
Information source -- Collector info (Sammler)   

be2_brochage_technique_ingenieur_e60_57_s.png BE2: Technique de l'ingénieur
Patrice Zeissloff

Just Qvigstad
BE2: Babani 1949-1951
Patrice Zeissloff

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