Antique radios, Old Time Radios

DF21

Country:	Europe	Brand:	Common type Europe tube
		Developer:	Philips; Eindhoven (tubes international!); Netherlands
		Tube type:	Vacuum Pentode RF/IF-Stage Controlling (mu)

Tube ID = 1861

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Identical to	DF21
Similar Tubes	Different connections: DF31 Other base: DF21_9pin
First year	1940 Tube leaflet collection E.Erb Philips Archive
First Source (s)	Mar.1940 : Philips Bulletin # D 78 1939 : Philips Buch
Predecessor Tubes	KF3 DF21_9pin
Successor Tubes	1941 DF25

Base	Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Vu)
Filament	Vf 1.4 Volts / If: 0.025 Ampere / -: Direct / -: Battery = /
Tube prices	0 Tube prices (visible for members only)
Literature	Taschenbuch zum Röhren-Codex 1948/49


	DF21: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse Karel De Reus †

DF21: Herbert Odermatt (eig. Sammlung)
Herbert Odermatt + 26.Nov.05

DF21: Telefunken Werkstattbuch
Wolfgang Bauer

DF21: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

Usage in Models	4= 1940?? ; 5= 1940? ; 16= 1940 ; 1= 1941?? ; 2= 1941? ; 12= 1941 ; 1= 1942?? ; 21= 1942 ; 1= 1943? ; 5= 1943 ; 6= 1944 ; 3= 1945 ; 1= 1946? ; 1= 1946 ; 3= 1947 ; 1= 1948?? ; 4= 1948 ; 10= 1949 ; 1= 1950?? ; 1= 1951
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 99

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