amplificateur de son à lampes ; alimentation courant alternatif 105-115 volts ; trois cadrans à aiguille milliampères ; contrôle de volume ; deux tubes ; interrupteur ; deux transformateurs ; batteries
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Western Electric
New York, New York
Electrical Research Products Incorporated
New York, N. Y., 250 West 57th Street
Informations non disponibles
Western Electric
New York, N. Y., 250 West 57th Street
Standard Telephones & Cables Ltd
Londres, Columbia House, Aldwych
Informations non disponibles
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Ouvert :
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Fermé :
Longueur : 31.5 cm
Largeur : 57 cm
Hauteur : 42 cm
Diamètre :
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Marques : "Western Electric Made in U.S.A." ; "N° 46 Bey Amplifier Made by Standard Telephones & Cables Ltd. Columbia House, Aldwych, London".
"The small current from the electrical reproducer or the photoelectric cell passes along to one or more vaccum tube amplifiers similar in principe to those used in the audiofrequency stages of radio sets ; these amplifiers deliver a greatly magnified copy of this current. The current from the amplifiers is converted into sound by means of sound projectors consisting of receivers and horns located at the screen" (Operating Instructions for Synchronous Reproducing Equipment Western Electric Sound Projector System for Theatres, New York, Electrical Research Products, 1928, p. 4-6).
Operating Instructions for Synchronous Reproducing Equipment Western Electric Sound Projector System for Theatres, New York, Electrical Research Products, 1928.