Antique radios, Old Time Radios

DK21

Country:	Netherlands	Brand:	Philips; Eindhoven (tubes international!); Netherlands
		Developer:	Philips; Eindhoven (tubes international!); Netherlands
		Tube type:	OCTODE Frequency converter Controlling (mu)

Tube ID = 1860

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Identical to	DK21
Similar Tubes	Different connections: DK31 Other base: DK21_9pin; DK25; DK25_Miniloktal
First year	1940 Tube leaflet collection E.Erb 41-1?
First Source (s)	Apr.1940 : Daten und Schaltungen moderner ... Röhren; Philips # 3 Mar.1940 : Philips Bulletin # D 78
Predecessor Tubes	KK2 DK21_9pin
Successor Tubes	DK25

Base	Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Vto)
Filament	Vf 1.4 Volts / If: 0.05 Ampere / -: Direct / -: Battery = /
Tube prices	0 Tube prices (visible for members only)
Literature	Taschenbuch zum Röhren-Codex 1948/49


	DK21: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse Karel De Reus †

DK21: r.hopfe
Reinhard Hopfe

DK21: Telefunken Werkstattbuch
Wolfgang Bauer

DK21: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

Usage in Models	3= 1940?? ; 3= 1940? ; 15= 1940 ; 3= 1941?? ; 2= 1941? ; 17= 1941 ; 16= 1942 ; 1= 1943?? ; 1= 1943? ; 3= 1943 ; 11= 1944 ; 5= 1945 ; 1= 1946? ; 1= 1946 ; 4= 1947 ; 1= 1948?? ; 3= 1948 ; 10= 1949 ; 2= 1950?? ; 1= 1950 ; 1= 1951
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 104

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