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EF22

Information - Help 
ID = 1870
       
Country:
Netherlands
Brand:
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to EF22 = W143 = CV303 = 6H2 = 6F22_Sweden
Similar Tubes
Other base:
  EF21_9pin ; EF41 ; EF9
First year Feb.1941 Tube leaflet collection E.Erb Philips Book III [178]
First Source (s)
Feb.1941 : Daten und Schaltungen moderner ... Röhren; Philips # 3
Jul.1941 : Radio-Mentor # 7
Predecessor Tubes EF9   EF21_9pin   EF22_9pin  
Successor Tubes 1947   EF41  

Base Loctal-8, B8G (Sylvania, 1938) (Codex=Waa)
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC
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 30 Tube prices (visible for members only)
Information source - - Manufacturers Literature   1940
Philips Bulletin   Juli 1941
Taschenbuch zum Röhren-Codex 1948/49

ef22.png
EF22: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †

ef22_sock.png EF22: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector


Just Qvigstad
ef22_spez.png
EF22: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

More ...
Usage in Models 4= 1941?? ; 29= 1941 ; 2= 1942?? ; 3= 1942? ; 36= 1942 ; 1= 1943?? ; 1= 1943? ; 42= 1943 ; 1= 1944?? ; 6= 1944? ; 51= 1944 ; 1= 1945?? ; 12= 1945? ; 21= 1945 ; 10= 1946?? ; 8= 1946? ; 44= 1946 ; 1= 1947?? ; 4= 1947? ; 51= 1947 ; 6= 1948?? ; 20= 1948? ; 68= 1948 ; 2= 1949?? ; 7= 1949? ; 42= 1949 ; 6= 1950?? ; 8= 1950? ; 33= 1950 ; 1= 1951?? ; 9= 1951? ; 21= 1951 ; 3= 1952?? ; 5= 1952? ; 9= 1952 ; 3= 1953? ; 5= 1953 ; 2= 1954? ; 4= 1954 ; 15= 1955?? ; 2= 1955? ; 14= 1955 ; 2= 1956?? ; 2= 1956? ; 9= 1956 ; 3= 1957?? ; 3= 1957? ; 5= 1957 ; 3= 1958?? ; 3= 1958 ; 3= 1960?? ; 1= 1960? ; 1= 1960 ; 1= 1961? ; 1= 1962 ; 1= 1965?? ; 1= 1970?? ; 1= 9999

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):653

Collection of

 
ef22_philips.jpg

EF22
 

Variants

EF22 in black aluminium can. MG = Metal - Glass.

Low profile military version.

EF22 in aluminium can (as EF50). MG = Metal - Glass.

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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