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ID = 28603
Great Britain (UK)
Brand: Thorpe Radio Valve Co/Bower Electric Ltd.; London
Tube type:  Space Charge Tetrode   Universal 
Identical to K4_Thorpe
First year 1925 Saga of the Vacuum Tube, Tyne page 388, 389

Base SPECIAL TUBEBASE in general
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.42 Ampere / Direct / Battery =

Made by Thorpe. For use in Unidyne and Solodyne circuits, operating without H.T.battery.

Text in other languages (may differ)
K4_Thorpe: TheNationalValveMuseum
Franz Scharner

More ...
K4_Thorpe: eigene Sammlung
Gerhard Eisenbarth


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