Frenophone amplifying speaker

Brown S. G. Ltd.; London

  • Jahr
  • 1923
  • Kategorie
  • Lautsprecher, Kopfhörer oder Ohrhörer
  • Radiomuseum.org ID
  • 104229

 Technische Daten

  • Wellenbereiche
  • - ohne
  • Betriebsart / Volt
  • Keine Stromversorgung
  • Lautsprecher
  • Trichter
  • Material
  • Diverses Material
  • von Radiomuseum.org
  • Modell: Frenophone amplifying speaker - Brown S. G. Ltd.; London
  • Form
  • Diverse Formen, unter Bemerkung beschrieben.
  • Abmessungen (BHT)
  • 25 x 13.25 x 10.25 inch / 635 x 337 x 260 mm
  • Bemerkung
  • Nickel-plated fittings, black enamelled metal horn, mahagony cabinet. A mechanical loud-speaker/amplifier primarily designed for use with crystal sets. The amplifying action depended on the friction between a revolving glass disc (driven by a 70 rpm clockwork gramophone motor) and a thin pad of cork: the pressure of the pad varied through a reed connected to the armature of a S.G. Brown Type 'A' headphone earpièce. The vibrations of the armature were magnified by the power in the friction drive and were applied to a horn-loaded diaphragm connected to the cork pad. (Radio!Radio Jonathan-Hill)

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