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ID = 28715
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Space Charge Tetrode 
  <1925 rare.
Identical to Q_Philips = Q_Ideezet
Similar Tubes
Normally replaceable-slightly different:
First year 1921 Saga of the Vacuum Tube, Tyne page 419, 420

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Sidecontact.
Filament Vf 4 Volts / If 0.5 Ampere / Direct / Battery =
Description Anode 4-8 Volt, space charge grid 2-6 Volt. In 1923 the Q had a brass base shell and the space charge grid was connected to this shell. You needed also a copper spring to connect this grid. The sidecontact was a 1924 invention. 
Dimensions (WHD)
incl. pins / tip
55 x 102 x 28 mm / 2.17 x 4.02 x 1.10 inch
Weight 44 g / 1.55 oz
Information source - - Manufacturers Literature   1-2-1923
Peter den Boer

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Peter den Boer


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