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ID = 6901
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Gas Rectifier   Power-supply 
Identical to 1071
Similar Tubes
Other base and data slightly different:
First Source (s)
Mar.1929 : Funk Bastler 1929, Heft 9

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
Filament Vf 2.1 Volts / If 2.8 Ampere /
Description Va = 2x500V max, Ia = 100mA max. From the B4 base, only the filament pins are connected. The carbon plates are in the arms. Measurements applies only to the bulb itself. Total W=118 mm including plates. 
Dimensions (WHD)
incl. pins / tip
66 x 168 x 35 mm / 2.60 x 6.61 x 1.38 inch
Literature Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   1929

Peter den Boer

1071: W.H.
Wolfgang Holtmann

1071: own collection
Peter den Boer

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