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3A4

Information - Help 
ID = 4280
       
Country:
United States of America (USA)
Brand:
Tube type:  Vacuum Pentode   Power/Output 
Identical to 3A4 = DL93 = 2P3 = CV2390 = CV807
Similar Tubes
Normally replaceable-slightly different:
  CV2300
Other class quality (otherwise equal):
  1662
Other base and data slightly different:
  DF15_Lorenz
First year 09.May.1942 Electron Tube Registration List
Successor Tubes 1662  
Base Miniatur-7-Pin-Base B7G, USA 1940 (Codex=Zzr)
Was used by Radio/TV-reception etc.
Filament Vf 2.8 Volts / If 0.1 Ampere / Direct / Battery =
Tube prices 4 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
3a4.png
3A4: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
501.png 3A4: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
Just Qvigstad 		3a4_techdat01.png
3A4: Sylvania Technical Manual
Peter Hoddow
More ...
Usage in Models 1= 1943?? ; 1= 1944? ; 1= 1945 ; 2= 1946 ; 1= 1947? ; 2= 1947 ; 1= 1948?? ; 2= 1948 ; 1= 1949?? ; 2= 1949 ; 1= 1950?? ; 1= 1951? ; 2= 1951 ; 3= 1952 ; 1= 1953?? ; 1= 1953? ; 1= 1953 ; 1= 1954? ; 1= 1955?? ; 1= 1955? ; 1= 1956 ; 3= 1960?? ; 1= 1960? ; 1= 1961? ; 1= 1962? ; 2= 1962 ; 1= 1964?? ; 1= 9999
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):38

Collection of

Peter Pfeiffer (D)
Martin Steyer (D)
Karl-Heinz Schmehr † 29.04.2016 (D)
Collection of a member from FIN
Tor Steinnes (N)
Rudolf Osterkamp (D)
Marcello Astolfi (I)
Michel Bel (NL)
Georges Werts (B)
Timo Rantasaari (FIN)
Heinz Schmidt (D)
Oskar Elm (D)
Collection of a member from D
Ulrich Fieseler (D)
Patrice Follet (F)
Patrice Zeissloff (F)
Stig Comstedt (S)
Karlheinz Fischer (D)
Tomasz Szczesniak (PL)
Collection of a member from D
 
3a4_8801.jpg

3A4
 
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