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ID = 13053
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Screen-grid Tetrode   Universal 
  Ca. 1925 up to 1945 rare.
Identical to SX2
Similar Tubes
Other shape (e.g. bulb type):
  B262 ; S22

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Er) Top contact with a cap.
Filament Vf 2 Volts / If 0.2 Ampere / Direct / Battery =
Description Amplion and Graham Farish Ltd. were some known manufacturers of this tube. Graham used RING as brand name. 
Dimensions (WHD)
incl. pins / tip
39 x 120 x 32 mm / 1.54 x 4.72 x 1.26 inch
Weight 46 g / 1.62 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
Peter den Boer

SX2: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20


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