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ECH4

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ID = 279
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode-Heptode   Frequency converter   Controlling (mu) 
Identical to ECH4
Similar Tubes
Other shape (e.g. bulb type):
  ECH4N
Heater different:
  ACH1n
Other base:
  ECH21 ; ECH34 ; ECH4A ; ECH4G
Multiple differences or of other kind:
  E1R ; ECH2_Tungsram
First year Jan.1940 Tube leaflet collection E.Erb Philips-Archive
First Source (s)
Jan.1940 : -- Original-techn. papers.
Predecessor Tubes ECH3   ECH2  
Successor Tubes 1941   ECH21   ECH41  

Base Europe side contact base P (P8A) (Codex=Sak)
Filament Vf 6.3 Volts / If 0.35 Ampere / Indirect / Parallel, (AC/DC)
Tube prices 14 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   
  ech4_1.png
  ECH4: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
 
ech4_666.jpg
ECH4: Collection JR
Jacob Roschy

 
au46.png
ECH4: RTT 1974 (Franzis) 13. Auflage
Martin Renz

 
daten_ech4.png
ECH4: g.h.
Gerhard Heigl


Usage in Models 1= 1938? ; 2= 1939?? ; 1= 1939? ; 2= 1939 ; 26= 1940?? ; 12= 1940? ; 45= 1940 ; 3= 1941?? ; 14= 1941? ; 139= 1941 ; 6= 1942?? ; 4= 1942? ; 74= 1942 ; 10= 1943?? ; 2= 1943? ; 58= 1943 ; 4= 1944?? ; 2= 1944? ; 30= 1944 ; 13= 1945?? ; 9= 1945? ; 34= 1945 ; 28= 1946?? ; 11= 1946? ; 66= 1946 ; 23= 1947?? ; 14= 1947? ; 107= 1947 ; 65= 1948?? ; 37= 1948? ; 130= 1948 ; 27= 1949?? ; 12= 1949? ; 146= 1949 ; 32= 1950?? ; 12= 1950? ; 75= 1950 ; 8= 1951?? ; 4= 1951? ; 20= 1951 ; 11= 1952?? ; 3= 1952? ; 6= 1952 ; 3= 1953?? ; 3= 1953 ; 1= 1954 ; 8= 1955?? ; 4= 1955 ; 1= 1957? ; 1= 1958?? ; 1= 1958? ; 1= 9999?? ; 6= 9999

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1357



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