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ID = 28888
Brand: Heussen, M. & Co; Arnhem
Developer: Heussen, M. & Co; Arnhem 
Tube type:  Space Charge Tetrode 
  <1925 very rare. ***
Identical to VE = HD3_Hercules
First year Oct.1922 Saga of the Vacuumtube, Tyne page 423 - 425
Successor Tubes VES  

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 3.8 Volts / Direct / Battery =
Description Ua = 8 volt only! The space charge grid is solded to the copper base shell. 
Dimensions (WHD)
incl. pins / tip
32 x 90 x 31 mm / 1.26 x 3.54 x 1.22 inch
Weight 53 g / 1.87 oz
Literature Historische Radios Band IV   
- - Manufacturers Literature   April 1922
VE: own collection
Peter den Boer

VE: own collection
Peter den Boer

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