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ID = 52266
Brand: Ideezet tubes (made by Philips); the Hague.
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode, vacuum 
  <1925 very rare. ***
Identical to 2Watt_Ideezet = 2Watt_Philips
Successor Tubes 1922   2.5Watt_Ideezet   F_Philips   F_Ideezet  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 4 Volts / If 1.4 Ampere / Direct / Battery =
Description This tube was rated 2.5 Watt in 1922 and was designated F. 
Information source - - -   Idzerda cat. A2 May 1920
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Peter den Boer

2Watt_Ideezet: own collection
Peter den Boer

from Just Qvigstad

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