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ID = 25116
Brand: Standard Telephones and Cables Pty, Ltd (STC), Sydney
Developer: Western Electric Company Inc.; New York (NY) 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to SY4104D = 104D
Similar Tubes
Heater different:

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Telephony
Filament Vf 4.4 Volts / If 0.97 Ampere / Direct / Specified voltage AND current AC/DC
Dimensions (WHD)
incl. pins / tip
59 x 109 x 58 mm / 2.32 x 4.29 x 2.28 inch
Tube prices 1 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   p.369

4104d.png SY4104D: Datenblatt
Wolfgang Bauer

Just Qvigstad
SY4104D: tube data book
Vaclav Pojer

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