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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 29 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? ; 42= 1943 ; 1= 1944?? ; 6= 1944? ; 51= 1944 ; 1= 1945?? ; 12= 1945? ; 21= 1945 ; 10= 1946?? ; 7= 1946? ; 44= 1946 ; 1= 1947?? ; 4= 1947? ; 50= 1947 ; 6= 1948?? ; 18= 1948? ; 68= 1948 ; 2= 1949?? ; 7= 1949? ; 42= 1949 ; 6= 1950?? ; 7= 1950? ; 31= 1950 ; 2= 1951?? ; 7= 1951? ; 17= 1951 ; 3= 1952?? ; 4= 1952? ; 9= 1952 ; 1= 1953? ; 3= 1953 ; 1= 1954? ; 4= 1954 ; 14= 1955?? ; 2= 1955? ; 12= 1955 ; 1= 1956?? ; 1= 1956? ; 7= 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):627

Collection of

Hannu Alho (FIN)
Tomasz Szczesniak (PL)
Christian Schaufelberger (CH)
Jacob Roschy (D)
Collection of a member from FIN
Ulrich Fieseler (D)
Jacky Parmentier (F)
Reinhard Riek (D)
Werner Wussow (D)
Sándor Selyem-Tóth (H)
Hans-Werner Ellerbrock (D)
Georges Werts (B)
Ottmar Rollmann (D)
Thomas Loidl (A)
Rudolf Osterkamp (D)
David Pfister (CH)
Trev Levick (D)
Jouko Laukkanen (FIN)
Timo Rantasaari (FIN)
Aldo Patriarca (CH)
Karl - Heinz Bossan (D)
Walter Nigg (FL)
Michael Niermann (D)
Andreas Reuther (D)
Tor Steinnes (N)
Jan Poortman (NL)
Peter Pfeiffer (D)
Bruno Candreia (CH)
Otto Frosinn (D)
Lars Nord (S)
Heinz Schmidt (D)
Collection of a member from D
 
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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