Antique radios, Old Time Radios

2A7

Country:	United States of America (USA)		Brand:	Common type USA
			Tube type:	Pentagrid-Converter (Heptode) Pentagrid (old) Controlling (mu)

Tube ID = 2651


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Identical to	2A7 = Ut-2A7 = ER2A7
Similar Tubes	Other shape (e.g. bulb type): 2A7S Heater different: 6A7; Ut-6A7; Ut6A7
First Series	1933 Radios von gestern page 231 (Base for 2A7 and 6D7)
Successor Tubes	6A8 6A8G

Base	7-Pin-Base U7A = small, old, USA (Codex=Mh) Top contact with a cap
Was used by	Radio/TV-reception etc.
Filament	Vf 2.5 Volts / If: 0.8 Ampere / -: Indirect / -: Parallel, (AC/DC) /
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 Karel De Reus

Röhrensammlung
Wolfgang Bauer

Telefunken Werkstattbuch
Wolfgang Bauer

Cunningham Radiotron Manual
Peter Hoddow

Usage in Models (calculation each 25th of the month)	2= 1931 ; 4= 1932 ; 7= 1933?? ; 16= 1933? ; 113= 1933 ; 22= 1934?? ; 19= 1934? ; 146= 1934 ; 12= 1935?? ; 10= 1935? ; 89= 1935 ; 6= 1936?? ; 11= 1936? ; 24= 1936 ; 1= 1937?? ; 1= 1937? ; 5= 1938 ; 1= 1939?? ; 5= 1939 ; 2= 1940 ;
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 496

No further Information for

2A7

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