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ID = 13052
Great Britain (UK)
Brand: Graham Farish Ltd.; Bromley
Tube type:  Screen-grid Tetrode   Audio Frequency 
Identical to SWG2
First Source (s)
1935 : British Radio Valves - The Classic Years: 1926-1946 P. 264 & Supplement, p. 41

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eu) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.2 Ampere / Direct

Tube made in Europe for the company. This tube is a short wave tetrode with the control grid from top cap and the tube has a porcelain base..

Information source Taschenbuch zum Röhren-Codex 1948/49   
Wireless World (The), London (WW, 79)   November 22, 1935 & October 11, 1935
L'ABCDaire des lampes de TSF des jeunes années
Röhrencodex , Röhren-Taschenbuch 1950 23000 Röhren

s_499_g.gif SWG2: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20

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