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DK21

Information - Help 
ID = 1860
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  OCTODE   Frequency converter   Controlling (mu) 
Identical to DK21 = MDK21
Similar Tubes
Different connections:
  DK31
Other base:
  DK21_9pin ; DK25 ; DK25_Miniloktal
First year 1940 Tube leaflet collection E.Erb 41-1?
First Source (s)
Apr.1940 : Daten und Schaltungen moderner ... Röhren; Philips # 3
Mar.1940 : Philips Bulletin # D 78
Predecessor Tubes KK2   DK21_9pin  
Successor Tubes DK25  

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Vto)
Filament Vf 1.4 Volts / If 0.05 Ampere / Direct / Battery =
Description The Philips 21- "Key Base" tubes were initially designed in 1940 with the 9-pin base B9G like the EF50. The later series production from 1942 on however was changed to the 8-pin Locktal-base B8G designed by Sylvania. There are also DK21's with International octal bases. 
Tube prices 5 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   
  dk21.png
  DK21: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
 
dk21_miniwatt.jpg
DK21: My tubes
Anonymous 413 Collector

 
105.png
DK21: Telefunken Werkstattbuch
Wolfgang Bauer

 
dk21_spec.png
DK21: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector


Usage in Models 3= 1940?? ; 7= 1940? ; 20= 1940 ; 3= 1941?? ; 5= 1941? ; 15= 1941 ; 1= 1942? ; 18= 1942 ; 1= 1943?? ; 2= 1943? ; 6= 1943 ; 12= 1944 ; 3= 1945? ; 5= 1945 ; 1= 1946? ; 1= 1946 ; 5= 1947 ; 1= 1948?? ; 5= 1948 ; 11= 1949 ; 3= 1950?? ; 1= 1950 ; 3= 1951 ; 1= 1952?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):133



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