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KF2

Information - Help 
ID = 1774
       
Country:
Europe
Brand: Common type Europe tube/semicond.
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to KF2 = VKF2
Similar Tubes
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)
Filament Vf 2 Volts / If 0.2 Ampere / Direct / Battery =
Description 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 Taschenbuch zum Röhren-Codex 1948/49   
  kf2.png
  KF2: Internet
Miguel Angel Trujillo-Rodriguez
 
kf2_01.jpg
KF2: Collection TL
Thomas Lebeth
 
kf12sok_1.png
KF2: J R
Jacob Roschy
 
kf2_spec.png
KF2: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

from Just Qvigstad
Usage in Models 1= 1934?? ; 2= 1934 ; 37= 1935 ; 13= 1936 ; 7= 1937
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):60
Collection of Jacob Roschy (D)
Collection of Thomas Lebeth (A)
Collection of Trev Levick (D)
Collection of Valery Gromov (RUS)
Collection of Thomas Loidl (A)
Collection of Tomasz Szczesniak (PL)
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