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ID = 28435
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Gas Triode 
  <1925 very rare. ***
Identical to C-I = C-1 = A_Ideezet = LLV_Ideezet = C-I_Ideezet
First year Apr.1922 Saga of the Vacuum Tube, Tyne 416
Production stop 1923

Base Edison medium E14 = 14 mm, mignon Base on each end.
Filament Vf 4 Volts / If 0.5 Ampere / Direct / Battery =
Description In 1920 the designation was C 1 and in 1921, 1922 and 1923 the designation was C II. 
Dimensions (WHD)
incl. pins / tip
24 x 115 x 22 mm / 0.94 x 4.53 x 0.87 inch
Weight 21 g / 0.74 oz
Information source - - Manufacturers Literature   722H 1-8-1921
Peter den Boer

C-I: own collection
Peter den Boer

from Just Qvigstad

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