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ID = 2501
Brand: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 rare.
Identical to EVN171
First year Oct.1916 - - Manufacturers Literature Erste Serie 4.Q.1916
First Source (s)
1914 : Saga of the Vacuum Tube, Tyne p.248
Feb.1918 : Die Kathodenröhre bei Empfangsanlagen-Verstärker-Audion-Überlagerer, 1918 Erste Serie 4.Q.1916
Successor Tubes EVE173  

Base Telefunken-Base 3 Pin+1 Socket (Codex=Byy)
Was used by Military and/or Government
Filament Vf 3 Volts / If 0.5 Ampere / Direct / Battery =

Careful! For using the EVN 171 a matching current limiter has to be placed in series! The filaments were burned rather on a certain filament current then filament voltage. When the tubes were manufactured, they were tested and a specific current limiter was selected. The range of these current limiters was from 0.53 to 0.56 Amps in steps of 0.01 Amp. This is indicated on the glass of the tube. For instance if you find the numbers 127796/6 that means that the serial number of the tube is 127796 and /6 will tell you that you should use a current limiter of 0.56 Amps in series.

Tube prices 12 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   
Taschenbuch zum Röhren-Codex 1948/49   
EVN171: Meine Sammlung
Rudolf Osterkamp

EVN171: own collection
Peter den Boer

EVN171: Telefunken Röhrenkatalog 1919
Thomas Günzel

from Just Qvigstad

Usage in Models 2= 1916 ; 1= 1917? ; 1= 1917

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):4

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