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ECH21 Country:  Netherlands      Brand:  Philips; - Eindhoven; Netherlands    Developer:  Philips; - Eindhoven; Netherlands    Tube type:  Triode-Heptode   Frequency converter   Controlling (mu)  Tube ID = 1867 previous  |  next Identical to ECH21 = ECH71 = X143 Similar Tubes Normally replaceable-slightly different:  TH1_BBC Other base:  ECH34; ECH4; ECH4G; ECH4N Other base and data slightly different:  ECH21_9pin Multiple differences or of other kind:  CV302 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 Vf 6.3 Volts / If: 0.35 Ampere / -: Indirect / -: Parallel, (AC/DC) / Tube prices 1 Tube prices (visible for members only) Literature Taschenbuch zum Röhren-Codex 1948/49        Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse Karel De Reus

R. Aufils Raynal Aufils   Variants RTT Schwandt Günther Stabe   RVF-Röhrenbuch-M1,1947 Anonymous 15 Collector

Usage in Models (calculation each 25th of the month)   1= 1940 ; 2= 1941? ; 48= 1941 ; 1= 1942?? ; 4= 1942? ; 58= 1942 ; 1= 1943? ; 58= 1943 ; 1= 1944?? ; 5= 1944? ; 73= 1944 ; 3= 1945?? ; 10= 1945? ; 29= 1945 ; 5= 1946? ; 83= 1946 ; 3= 1947?? ; 5= 1947? ; 100= 1947 ; 8= 1948?? ; 10= 1948? ; 112= 1948 ; 3= 1949?? ; 11= 1949? ; 110= 1949 ; 9= 1950?? ; 10= 1950? ; 73= 1950 ; 1= 1951?? ; 7= 1951? ; 34= 1951 ; 2= 1952? ; 18= 1952 ; 2= 1953? ; 9= 1953 ; 2= 1954?? ; Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):   983

Variants
Eigene Sammlung Albrecht Schwaderer	ECH21*Siemens Austria Nur Siemens Austria fertigte diese Röhre mit dem Pumpstutzen an der Röhrenspitze. 07.Feb.2009
	ECH21*Stahl Ab 1944 von Albis (CH) entwickelte Stahlröhre, deren Produktion 1945 wieder eingestellt wurde . Von den Stahlausführungen der ECH21, EF22, EBL21 und AZ21 wurden insegesamt nur einige hundert Stück hergestellt. Quelle: Willi, E., Schweizer Elektronenröhren, 2005 07.Oct.2009

No further Information for ECH21

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