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ECH4

Information - Help 
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 P8A (Au P, 8SC) (Codex=Sak)
Filament Vf 6.3 Volts / If 0.35 Ampere / Indirect / Specified voltage AC/DC
Tube prices 15 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   

ech4_1.png
ECH4: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †

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


Just Qvigstad
daten_ech4.png
ECH4: g.h.
Gerhard Heigl

More ...
Usage in Models 1= 1938? ; 2= 1939?? ; 1= 1939? ; 2= 1939 ; 27= 1940?? ; 16= 1940? ; 46= 1940 ; 3= 1941?? ; 14= 1941? ; 140= 1941 ; 7= 1942?? ; 4= 1942? ; 76= 1942 ; 10= 1943?? ; 2= 1943? ; 58= 1943 ; 4= 1944?? ; 3= 1944? ; 32= 1944 ; 19= 1945?? ; 8= 1945? ; 39= 1945 ; 29= 1946?? ; 12= 1946? ; 64= 1946 ; 27= 1947?? ; 18= 1947? ; 112= 1947 ; 72= 1948?? ; 39= 1948? ; 132= 1948 ; 28= 1949?? ; 16= 1949? ; 146= 1949 ; 36= 1950?? ; 17= 1950? ; 75= 1950 ; 8= 1951?? ; 4= 1951? ; 21= 1951 ; 9= 1952?? ; 3= 1952? ; 6= 1952 ; 5= 1953?? ; 3= 1953 ; 1= 1954?? ; 2= 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):1421


Collection of

 
ech4_666.jpg

ECH4
 

Variants

ECH4 with gold-colored bulb, although the ECH4 belongs to the red series.

Tungsram always was imaginative to simplify their production process. Since the ECH4 and the ECH21 have equal characteristics, the simply put the ECH21 structure into the old-style side-contact bulb to make a modernized ECH4. As the ECH21 structure already has a metal shield around, no metallized coating at the glass bulb was required any more. Jacob Roschy

ECH4 with tubular (straight) bulb


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