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ID = 28601
Great Britain (UK)
Brand: Thorpe Radio Valve Co/Bower Electric Ltd.; London
Developer: Thorpe Radio Valve Co/Bower Electric Ltd.; London 
Tube type:  Triode, vacuum   Universal 
  <1925 rare.
Identical to K1_Thorpe
First year 1924 Saga of the Vacuumtube, Tyne page 388
First Source (s)
1924 : British Radio Valves - The Vintage Years, Thrower p.41

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 5 Volts / If 0.42 Ampere / Direct / Battery =
Description Thrower quotes 0.36 amp, while Tyne gives 0.42 amps.
Used a spiral wire wound anode. Probably to circumvent the Marconi patent for cylindrical anode. Thorpe pretended this to be a more efficient "electron trap"... 
Dimensions (WHD)
incl. pins / tip
48 x 124 x 30 mm / 1.89 x 4.88 x 1.18 inch
Weight 55 g / 1.94 oz
Literature British Radio Valves - The Vintage Years, Thrower   
Peter den Boer

K1_Thorpe: own collection
Peter den Boer

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