radiomuseum.org
Please click your language flag. Bitte Sprachflagge klicken.

DF21

Information - Help 
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)
Information source Taschenbuch zum Röhren-Codex 1948/49   
df21.png
DF21: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
104.png DF21: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		df21_spec.png
DF21: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector
More ...
Usage in Models 5= 1940?? ; 8= 1940? ; 20= 1940 ; 1= 1941?? ; 4= 1941? ; 12= 1941 ; 1= 1942? ; 25= 1942 ; 1= 1943?? ; 4= 1943? ; 8= 1943 ; 1= 1944? ; 7= 1944 ; 2= 1945? ; 3= 1945 ; 2= 1946? ; 1= 1946 ; 6= 1947 ; 1= 1948?? ; 2= 1948? ; 7= 1948 ; 1= 1949? ; 12= 1949 ; 2= 1950?? ; 3= 1951 ; 1= 1952?
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):140

Collection of

Herbert Odermatt † 26.Nov.05 (CH)
Aldo Patriarca (CH)
Christian Schaufelberger (CH)
Eduard Abfalterer (I)
Georges Werts (B)
Timo Rantasaari (FIN)
Collection of a member from FIN
Danko Tkalec (HR)
Tomasz Szczesniak (PL)
Valery Gromov (RUS)
Trev Levick (D)
Collection of a member from D
Karl - Heinz Bossan (D)
Michael Wilhammer (D)
Ralph Oppelt † 3.4.24 (D)
Peter Pfeiffer (D)
Jacob Roschy (D)
 
df21_1_1.jpg

DF21
 
You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]
  
Data Compliance More Information