Antique radios, Old Time Radios

7A4

Country:	United States of America (USA)		Brand:	Common type USA
			Tube type:	Triode, vacuum Universal

Tube ID = 3559


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Identical to	7A4 = VT-192
Similar Tubes	Other class quality (otherwise equal): XXL Heater different: 14A4 Other base: 6J5GT
First Source (s)	08.Mar.1939 : Electron Tube Registration List
Predecessor Tubes	6J5G 6J5 6P5G 6P5GT

Base	Loctal-8, B8G (Sylvania, 1938) (Codex=W)
Was used by	Radio/TV-reception etc.
Filament	Vf 6.3 Volts / If: 0.3 Ampere / -: Indirect / -: Parallel / series AC/DC /
Description	= 1 unit of 7N7 Text in other languages (may differ)
Tube prices	0 Tube prices (visible for members only)
Literature	Essential Characteristics, GE 1973 Taschenbuch zum Röhren-Codex 1948/49


	Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse Michael Schlör

Timo Tuunanen

Telefunken Werkstattbuch
Wolfgang Bauer

Sylvania Technical Manual
Peter Hoddow

Usage in Models (calculation each 25th of the month)	5= 1939 ; 10= 1940 ; 1= 1941?? ; 1= 1941? ; 24= 1941 ; 12= 1942 ; 6= 1946 ; 1= 1947?? ; 1= 1947? ; 4= 1947 ; 1= 1948? ; 31= 1948 ; 3= 1949 ; 1= 1950 ; 7= 1951?? ; 2= 1952?? ; 1= 1955?? ;
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 111

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7A4

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