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ID = 28560
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode, vacuum 
  <1925 very rare. ***
Identical to F_Philips = 2.5Watt_Ideezet = F_Ideezet
First year Apr.1922 Saga of the Vacuum Tube, Tyne page 416, 417
Predecessor Tubes 2Watt_Ideezet   2Watt_Philips  
Successor Tubes Z1  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 4 Volts / If 1.4 Ampere / Direct / Battery =
Description Is listed as 2 Watt in the Philips catalogue H402 August 1920. 
Dimensions (WHD)
incl. pins / tip
50 x x mm / 1.97 x x inch
Information source - - Manufacturers Literature   722H 1-8-1922
Peter den Boer

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F_Philips: own collection
Peter den Boer

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