Antique radios, Old Time Radios

2A7S

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

Tube ID = 8548

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Identical to	2A7S
Similar Tubes	Other shape (e.g. bulb type): 2A7

Base	7-Pin-Base U7A = small, old, USA (Codex=Mh)
Filament	Vf 2.5 Volts / If: 0.8 Ampere / -: Indirect / -: Parallel, (AC/DC) /
Description	Which differences of characteristics between 2A7S and 2A7 ? Babani's International Radio Tube Encylopedia gives a different Ig2 current as a 2A7, but Brans Vademecum 1945 and 1961 gives as electrical equivalent Text in other languages (may differ)
Tube prices	0 Tube prices (visible for members only)
Literature	Taschenbuch zum Röhren-Codex 1948/49 Babani, International Radio Tube Encyclopaedia

2A7S
Emilio Ciardiello

2A7S: Babani 1949-1951
Patrice Zeissloff

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