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AZ21

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ID = 2741
       
Country:
Netherlands
Brand:
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
Identical to AZ21 = GG1
Similar Tubes
Different connections:
  U84
Other base and data slightly different:
  AZ1 ; AZ21_9pin
First year 1941 Tube leaflet collection E.Erb *Analysis by original leaflets
First Source (s)
Jul.1941 : Radio-Mentor # 7
Predecessor Tubes AZ1   AZ21_9pin  
Successor Tubes AZ41  
Base Loctal-8, B8G (Sylvania, 1938) (Codex=Wx)
Filament Vf 4 Volts / If 1 Ampere / Direct
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.

 
Tube prices 10 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   Design = Philips
az21_1.png
AZ21: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †     More ...
az21_sock.png AZ21: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector
More ...
Just Qvigstad 		az21_philips_miniwatt_1941_p1_data.png
AZ21: Philips_Miniwatt 1941 Blackbook
Adrian Riesen
More ...
Usage in Models 2= 1941?? ; 13= 1941 ; 2= 1942?? ; 1= 1942? ; 23= 1942 ; 1= 1943?? ; 2= 1943? ; 32= 1943 ; 2= 1944? ; 41= 1944 ; 4= 1945? ; 16= 1945 ; 6= 1946?? ; 18= 1946 ; 1= 1947?? ; 14= 1947 ; 1= 1948?? ; 18= 1948 ; 21= 1949 ; 3= 1950?? ; 1= 1950? ; 11= 1950 ; 6= 1951? ; 11= 1951 ; 1= 1952?? ; 3= 1952 ; 1= 1953? ; 6= 1953 ; 1= 1954?? ; 1= 1954 ; 1= 1955 ; 1= 1956?? ; 2= 1956 ; 5= 1957? ; 3= 1957 ; 1= 1958?? ; 3= 1958? ; 1= 1959 ; 1= 1960? ; 1= 1960 ; 1= 1961 ; 1= 1962 ; 1= 1963?? ; 1= 1965 ; 1= 1966 ; 1= 1968??
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):288

Collection of

Collection of a member from SK
Thomas Loidl (A)
Georges Werts (B)
Karl - Heinz Bossan (D)
Sándor Selyem-Tóth (H)
Egon Penker (A)
Jacob Roschy (D)
Tomasz Szczesniak (PL)
Tor Steinnes (N)
Christian Schaufelberger (CH)
Sepp Juster (A)
Albrecht Schwaderer (D)
Danko Tkalec (HR)
Günter Denoth (A)
Collection of a member from A
Albert Weiss (A)
Collection of a member from FIN
Aldo Patriarca (CH)
Reinhard Riek (D)
 
az21_038r.jpg

AZ21
 

Variants

Ab 1950/51 bei Siemens Austria als Eigenbautype mit Saugstutzen an den Röhrenspitze gefertigt.
Ab 1944 von Albis (CH) entwickelte Stahlröhre, deren Produktion 1945 wieder eingestellt wurde.
Von den Stahlausführungen der ECH21, EF22, EBL21 und AZ21 wurden insgesamt nur einige hundert Stück hergestellt.
Quelle: Willi, E., Schweizer Elektronenröhren, 2005.
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