Mail-A-Voice BK-503

• País
• Estados Unidos

• Fabricante / Marca
• Brush Development Co. / Clevite Electronic Components; Cleveland, Ohio

• Año
• 1948–1950

• Categoría
• Registrador o reproductor de sonido o visual

• Radiomuseum.org ID
• 129443

• • alternative name: Brush Electronics

• Imágenes
• Esquemas

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Haga clic en la miniatura esquemática para solicitarlo como documento gratuito.

• Numero de valvulas
• 3

• Válvulas
• 6SL7GT 6SN7GT 6X5GT

• Principio principal
• Amplificador de Audio

• Gama de ondas
• - no hay

• Especialidades
• Otro grabador y/o reproductor

• Tensión de funcionamiento
• Red: Corriente alterna (CA, Inglés = AC) / 60 Hz: 110-120 Volt

• Altavoz
• - solamente tiene Auricular (mini) de oido

• Material
• Metálico

• de Radiomuseum.org
• Modelo: Mail-A-Voice BK-503 - Brush Development Co. /

• Forma
• Sobremesa de cualquier forma, detalles no conocidos.

• Ancho, altura, profundidad
• 300 x 140 x 280 mm / 11.8 x 5.5 x 11 inch

• Anotaciones

• The model BK-503 Mail-A-Voice from "The Brush Development Company", represents an entirely different approach to the problem of storing information on a magnetic medium. The recording material in this case is in the form of a 9-inch disc, and the sound track is a spiral running from an inner diameter of 5 inches to the outer edge. The recording track has a width of 0.014 inch, and the pitch of the spiral is 0.025 inch. Despite this close spacing, no noticeable crosstalk can be detected. The powder-coated paper discs can be folded and mailed like an ordinary letter. No guide grooves are provided on the coated discs.
  
  The turntable rotates 20 r.p.m., resulting in a total recording time of slightly over 3 min. This instrument deserves special mention because it presently represents the most simple and basically the most inexpensive mechanical and electrical design for a magnetic recorder that has been produced commercially. A single crystal headphone is used both as a recording microphone and as a playback earphone.

  See also the combination with the SWISS Repondomat as a telephone answering machine. The Mail-A-Voice model BK-503 might have existed one or two years before 1948. But for us only 1948 to 1950 is for sure.

• Peso neto
• 6.5 kg / 14 lb 5.1 oz (14.317 lb)

• Autor
• Modelo creado por Ernst Erb. Ver en "Modificar Ficha" los participantes posteriores.

• Otros modelos

• Donde encontrará 43 modelos, 39 con imágenes y 22 con esquemas.
  Ir al listado general de Brush Development Co. / Clevite Electronic Components; Cleveland, Ohio