Mail-A-Voice BK-503

• Pays
• Etats-Unis

• Fabricant / Marque
• Brush Development Co. / Clevite Electronic Components; Cleveland, Ohio

• Année
• 1948–1950

• Catégorie
• Enrégistreur et/ou reproducteur son/video

• Radiomuseum.org ID
• 129443

• • alternative name: Brush Electronics

• Images
• Schémas

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• No. de tubes
• 3

• Lampes / Tubes
• 6SL7GT 6SN7GT 6X5GT

• Principe général
• Amplification audio

• Gammes d'ondes
• - sans

• Particularités
• Autre appareil d'enregistrement

• Tension / type courant
• Alimentation Courant Alternatif (CA) / 60 Hz: 110-120 Volt

• Haut-parleur
• - Seulement pour écouteur

• Matière
• Boitier métallique

• De Radiomuseum.org
• Modèle: Mail-A-Voice BK-503 - Brush Development Co. /

• Forme
• Modèle de table générique

• Dimensions (LHP)
• 300 x 140 x 280 mm / 11.8 x 5.5 x 11 inch

• Remarques

• 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.

• Poids net
• 6.5 kg / 14 lb 5.1 oz (14.317 lb)

• Auteur
• Modèle crée par Ernst Erb. Voir les propositions de modification pour les contributeurs supplémentaires.

• D'autres Modèles

• Vous pourrez trouver sous ce lien 43 modèles d'appareils, 39 avec des images et 22 avec des schémas.
  Tous les appareils de Brush Development Co. / Clevite Electronic Components; Cleveland, Ohio