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DL21

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ID = 1863
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Vacuum Pentode   Power/Output 
Identical to DL21 = MDL21
Similar Tubes
Other base:
  DL21_9pin
Other base and data slightly different:
  DL11
First year 1940 Tube leaflet collection E.Erb P=41-1
First Source (s)
Feb.1940 : Daten und Schaltungen moderner ... Röhren; Philips # 3
Mar.1940 : Philips Bulletin # D 78
Predecessor Tubes KL4   DL21_9pin  
Successor Tubes 1948   DL41  

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Voo)
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 DL21's with international octal bases. 
Tube prices 5 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   
  dl21.png
  DL21: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
 
dl21.jpeg
DL21: From my collection.
Niclas Pettersson

 
103.png
DL21: Telefunken Werkstattbuch
Wolfgang Bauer

 
dl21_spec.png
DL21: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector


Usage in Models 4= 1940?? ; 7= 1940? ; 20= 1940 ; 3= 1941?? ; 5= 1941? ; 16= 1941 ; 2= 1942? ; 16= 1942 ; 1= 1943?? ; 2= 1943? ; 6= 1943 ; 9= 1944 ; 1= 1945?? ; 3= 1945? ; 5= 1945 ; 1= 1946? ; 4= 1947 ; 1= 1948?? ; 6= 1948 ; 8= 1949 ; 1= 1950?? ; 3= 1951 ; 1= 1952?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):125


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