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K4_Thorpe

           
  Tube type:  Space Charge Tetrode   Universal 
Tube ID = 28603
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Identical to K4_Thorpe
First year   1925 Saga of the Vacuumtube, Tyne page 388, 389

Base OTHER TUBEBASE in general
Filament Vf 6 Volts / -: Direct / -: Battery = /
Description Made by Thorpe. For use in Unidyne and Solodyne circuits, operating without H.T.battery. 
Text in other languages (may differ)

uk_thorpe_unidyne_k4.jpg
K4_Thorpe: my collection
Alan Douglas

 

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