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ID = 51074
Brand: Pope's Draad- en Lampenfabrieken; Venlo
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Gas Triode   Detector 
  <1925 very rare. ***
Identical to PR11_Condor = Detector_Star = PR11_Pope = D1 = D-I

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 3.5 Volts / If 0.5 Ampere / Direct / Battery =
Description The PR11 = Philips D1 was supplied with B4 base and in the shape of a D4 with an UV base. The D4 had the same characteristics as the D1, but had a UV base and different envelope. See pictures. 
Information source - - Manufacturers Literature   1925

b4base.png PR11_Condor
Peter den Boer

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