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ID = 28714
Great Britain (UK)
Tube type:  Triode, vacuum   Detector 
Identical to Q_Marconi = UM-104A
First year 1916 Saga of the Vacuum Tube, Tyne page 224

Base Soffit Side contacts
Filament Vf 5 Volts / If 0.45 Ampere / Direct / Battery =

Detector companion to the V24. Low capacity design.

Dimensions (WHD)
incl. pins / tip
25 x 71 x mm / 0.98 x 2.80 x inch
Weight 11 g / 0.39 oz
Tube prices 3 Tube prices (visible for members only)
Information source British Radio Valves - The Vintage Years, Thrower   
  Q_Marconi: Thermionic tubes, John Scott-Taggart
Emilio Ciardiello
Geri Meier

Q_Marconi: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

Usage in Models 1= 1924??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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