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ECH21 Info
Country:  Netherlands      Brand:  Philips; - Eindhoven; Netherlands 
  Developer:  Philips; - Eindhoven; Netherlands 
  Tube type:  Triode-Heptode   Frequency converter   Controlling (mu) 
Tube ID = 1867
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Identical to ECH21 = ECH71 = X143
Similar Tubes ECH4 (other base)   TH1_BBC (can normally be replaced - small diff'ce)   ECH4G (other base)   ECH34 (other base)   CV302 (Multiple differences or of other kind)   ECH21_9pin (other base and data slightly different)  
First Series   Feb.1941 Tube leaflet collection E.Erb Philips Book (P11-41)
First Source (s) Jul.1941 : Radio-Mentor # 7
Feb.1941 : Daten und Schaltungen moderner ... Röhren; Philips # 3
Predecessor Tubes ECH4   ECH3   ECH21_9pin  
Successor Tubes ECH41   ECH42  

Base Loctal-8, B8G (Sylvania, 1938) (Codex=Wf)
Was used by Radio/TV-reception etc.
Filament -: Indirect / -: Parallel, (AC/DC) / If: 0.35 Ampere / Vf 6.3 Volts /
Tube prices 1 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   

  ech21.gif
  Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus
ech21_4.jpg
R. Aufils
Raynal Aufils

 
lo14_g.gif
RTT Schwandt
Günther Stabe

 
ech21_spec.png
RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

Usage in Models   2= 1941? ; 48= 1941 ; 1= 1942?? ; 4= 1942? ; 58= 1942 ; 1= 1943? ; 56= 1943 ; 1= 1944?? ; 5= 1944? ; 71= 1944 ; 2= 1945?? ; 9= 1945? ; 27= 1945 ; 4= 1946? ; 79= 1946 ; 3= 1947?? ; 1= 1947? ; 96= 1947 ; 8= 1948?? ; 9= 1948? ; 112= 1948 ; 1= 1949?? ; 9= 1949? ; 105= 1949 ; 8= 1950?? ; 8= 1950? ; 69= 1950 ; 1= 1951?? ; 7= 1951? ; 31= 1951 ; 2= 1952? ; 18= 1952 ; 2= 1953? ; 9= 1953 ; 1= 1954?? ; 2= 1954? ;
Number of Models with this tube   933
No further Information for

ECH21    

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