Mail-A-Voice BK-503

• Paese
• USA (Stati Uniti d'America)

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

• Anno
• 1948–1950

• Categoria
• Registratore audio/video e/o riproduttore 

• Radiomuseum.org ID
• 129443

• • alternative name: Brush Electronics

• Immagini
• Schemi

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• Numero di tubi
• 3

• Valvole
• 6SL7GT 6SN7GT 6X5GT

• Principio generale
• Amplificatore audio

• Gamme d'onda
• - senza

• Particolarità
• Altri registratori/riproduttori

• Tensioni di funzionamento
• Alimentazione a corrente alternata (CA) / 60 Hz: 110-120 Volt

• Altoparlante
• - solo per cuffie o auricolari

• Materiali
• Mobile di metallo

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

• Forma
• Soprammobile con qualsiasi forma (non saputo).

• Dimensioni (LxAxP)
• 300 x 140 x 280 mm / 11.8 x 5.5 x 11 inch

• Annotazioni

• 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 netto
• 6.5 kg / 14 lb 5.1 oz (14.317 lb)

• Autore
• Modello inviato da Ernst Erb. Utilizzare "Proponi modifica" per inviare ulteriori dati.

• Altri modelli

• In questo link sono elencati 43 modelli, di cui 39 con immagini e 22 con schemi.
  Elenco delle radio e altri apparecchi della Brush Development Co. / Clevite Electronic Components; Cleveland, Ohio