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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 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 †     More ...
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?? ; 2= 1939 ; 27= 1940?? ; 17= 1940? ; 47= 1940 ; 3= 1941?? ; 15= 1941? ; 141= 1941 ; 9= 1942?? ; 4= 1942? ; 74= 1942 ; 10= 1943?? ; 3= 1943? ; 58= 1943 ; 4= 1944?? ; 3= 1944? ; 32= 1944 ; 18= 1945?? ; 9= 1945? ; 40= 1945 ; 32= 1946?? ; 12= 1946? ; 64= 1946 ; 30= 1947?? ; 18= 1947? ; 113= 1947 ; 76= 1948?? ; 41= 1948? ; 132= 1948 ; 29= 1949?? ; 19= 1949? ; 146= 1949 ; 38= 1950?? ; 18= 1950? ; 76= 1950 ; 10= 1951?? ; 4= 1951? ; 19= 1951 ; 9= 1952?? ; 3= 1952? ; 6= 1952 ; 6= 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):1448
Museum "Philips Historische Producten"

Collection of

Heinz Schmidt (D)
Carlo La Perna (I)
Museum Roggenhofer (A)
Tor Steinnes (N)
Otto Frosinn (D)
Collection of a member from SK
Aldo Patriarca (CH)
Jochen Amend (D)
Danko Tkalec (HR)
Emilio Ciardiello (I)
Alberto Ammendola (I)
Antonio Bordini (I)
Marcello Astolfi (I)
Oskar Elm (D)
Werner Wussow (D)
Ulrich Fieseler (D)
Hans Pierrel (D)
Wolfgang Bauer (A)
Uwe Rössler (D)
Wouter Brughmans (B)
Valery Gromov (RUS)
Georges Werts (B)
Massimo Pedrina (I)
Tomasz Szczesniak (PL)
Jose Luis Villabona Horreo (E)
Bruno Candreia (CH)
Collection of a member from D
Jürgen Küting (D)
Daniel Consales (D)
Jürgen Tiedmann (D)
Peter Pfeiffer (D)
Christian Schaufelberger (CH)
Peter Steffen (CH)
Peter Böhm (D)
João-Afonso Santos (P)
Etienne Flemal (B)
Hartmut Völler (D)
René Goebel † 21.12.23 (D)
Klaus Neumann (D)
Sándor Selyem-Tóth (H)
Emilio Focosi (I)
Marco Lagendijk (NL)
Jacob Roschy (D)
Benedetto Pirani (I)
Mauro Minghetti (I)
Jose Antonio Gonzalez-Ruiz (E)
Franco Antolini (I)
Klemens Rhode (D)
Bekir Yurdakul (F)
Collection of a member from D
Collection of a member from FIN
Ottmar Rollmann (D)
Aires Gomes (P)
Karl - Heinz Bossan (D)
Antonio Varrica (I)
Sepp Juster (A)
 
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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