Light-Beam Reproducer

Philco, Philadelphia Stg. Batt. Co.; USA

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  • Année
  • 1940 ?
  • Catégorie
  • Microphone ou élément Pick-Up / tête de lecture
  • Radiomuseum.org ID
  • 339679

Cliquez sur la vignette du schéma pour le demander en tant que document gratuit.

 Spécifications techniques

  • Gammes d'ondes
  • - sans
  • Haut-parleur
  • - Pour casque ou amplificateur BF
  • De Radiomuseum.org
  • Modèle: Light-Beam Reproducer - Philco, Philadelphia Stg. Batt
  • Remarques

  • Philco Light-Beam Reproducer was introduced by Philco in 1940 as an alternative to a phonograph cartridge (with stylus). 

    The design was a light source, a very light weight mirror mounted on the shaft of the jeweled needle, and a photocell that changes the reflected light, now modulated by the record grooves, into an audio electrical signal.  This was marketed with new photo-electric radio phonograph models as "Music on a Beam of Light".

    To eliminate hum due to using normal 50/60 Hz AC powering the light source, a high RF frequency oscillator light source was used.  Since the high RF frequency was too high to be heard in the audio range, hum was cleverly solved.  Philco claimed that the records lasted 10 times more than a using a normal phonopraph cartridge.

    Some models that used this reproducer, or a version of it, were the Philco 41-629P, Philco 1012, Philco 42-1012P, Philco 42-1013PM, and Philco 42-1013PW

  • Littérature
  • Principles and Practice of Radio Servicing, H.J.Hicks, 1943
  • Schémathèque (1)
  • Movie-Radio Guide, March 29 1941, page 3
  • Auteur
  • Modèle crée par Wolfgang Müllner. Voir les propositions de modification pour les contributeurs supplémentaires.

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