7-A Peerless Magnetic Reproducer

United Radio Corporation (Peerless); Rochester NY

  • Année
  • 1928/1929
  • Catégorie
  • Haut-parleur, casque ou écouteur
  • Radiomuseum.org ID
  • 84323

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

 Spécifications techniques

  • Gammes d'ondes
  • - sans
  • Tension / type courant
  • Pas d'alimentation nécessaire
  • Haut-parleur
  • HP magnétique (sans details)
  • Matière
  • Boitier en bois
  • De Radiomuseum.org
  • Modèle: 7-A Peerless Magnetic Reproducer - United Radio Corporation
  • Forme
  • Modèle de table vertical cathédrale (dessus arrondi)
  • Dimensions (LHP)
  • 292 x 328 x 182 mm / 11.5 x 12.9 x 7.2 inch
  • Remarques
  • The logo says: "Peerless Reproducer - Manufactured by United Radio Corp., Rochester, NY, USA".  Peerless used parchment cones.  This speaker is essentially identical to the 7-A Peerless Magnetic Reproducer that was manufactured by the successor company United Reproducers Corp.

    There are two key patents for the Reproducer. Number 1,726,524, filed in July 1927, covers the design of an annular of freely flexible inelastic material. Igor Bobrovsky, the inventor, claimed that the ring improved sound quality of the cone. The ring is clearly visible between the beige paper cone and black steel frame. The second patent, filed in June 1927, is for a speaker with a U-shaped permanent magnet that surrounds an actuating winding. The winding drives a piston that connects to the speaker cone, producing sound. Bobrovsky filed the patent application and claimed that the actuating winding vibrates an “armature” connected to a “driving rod” connected to the cone. A lever provides a 3:2 ratio of driving rod movement compared to the armature movement.

    Isaac Harris of Buffalo NY designed the box and filed a patent application in March 1928.

    Note that some of the model pictures show a "C" rather than an "A" on the cone.  These are Series designations.  The "C" model is still believed to be a model 7-A.

  • Prix de mise sur le marché
  • 30.00 $
  • Schémathèque (1)
  • Chicago Salvage Stock Store catalogue, 1928?
  • Auteur
  • Modèle crée par Alessandro De Poi. Voir les propositions de modification pour les contributeurs supplémentaires.

 Collections | Musées | Littérature

Collections

Le modèle 7-A Peerless Magnetic Reproducer fait partie des collections des membres suivants.

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