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DF21

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ID = 1861
       
Country:
Europe
Brand: Common type Europe tube/semicond.
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to DF21 = MDF21
Similar Tubes
Different connections:
  DF31
Other base:
  DF21_9pin
First year 1940 Tube leaflet collection E.Erb Philips Archive
First Source (s)
Mar.1940 : Philips Bulletin # D 78
1939 : Philips Buch
Predecessor Tubes KF3   DF21_9pin  
Successor Tubes 1941   DF25  

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Vu)
Filament Vf 1.4 Volts / If 0.025 Ampere / Direct / Battery =
Tube prices 2 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   
  df21.png
  DF21: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
 
valvo_df21.jpg
DF21: Own collection
Eduard Abfalterer

 
104.png
DF21: Telefunken Werkstattbuch
Wolfgang Bauer

 
df21_spec.png
DF21: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector


Usage in Models 4= 1940?? ; 6= 1940? ; 20= 1940 ; 1= 1941?? ; 4= 1941? ; 12= 1941 ; 1= 1942? ; 25= 1942 ; 2= 1943? ; 8= 1943 ; 7= 1944 ; 2= 1945? ; 3= 1945 ; 1= 1946? ; 1= 1946 ; 5= 1947 ; 1= 1948?? ; 7= 1948 ; 12= 1949 ; 2= 1950?? ; 3= 1951 ; 1= 1952?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):128


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