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ID = 1774
Brand: Common type Europe tube/semicond.
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to KF2 = VKF2
Similar Tubes
Normally replaceable-slightly different:
Other base:
  HP211C ; KF2_UX6 ; RES192 ; SE211
Other base and data slightly different:
  H208D ; HP215
First year Nov.1934 Philips Bulletin # D20
First Source (s)
Nov.1934 : Philips Bulletin # D20
Successor Tubes 1936   KF3  

Base Europe 7-Pin C7A (Hx C, C7, C) 1933 (Codex=Lr) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.2 Ampere / Direct / Battery =

EE: An ad November 30th 1934 in "Radio & Electrical Merchant" Australia shows a battery console model 46 Challenger with KF2, 1C6, KF2, KBC1, B217 and B240. It is not unlikely that this model could not be delivered until the tube was on market in 1935. Many months before the official market introduction, some manufacturers get pre series examples to build circuits with them ...

Information source - - Manufacturers Literature   
Babani, International Radio Tube Encyclopaedia   p. 112 & 113
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

KF2: Internet
Miguel Angel Trujillo-Rodriguez

kf12sok_1.png KF2: J R
Jacob Roschy

More ...

Just Qvigstad
KF2: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

More ...
Usage in Models 2= 1934 ; 1= 1935?? ; 37= 1935 ; 13= 1936 ; 7= 1937

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):60

Collection of



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