• Country
• Great Britain (UK)

• Manufacturer / Brand
• Brown S. G. Ltd.; London

• Year
• 1923

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 104229

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• Horn

• Material
• Various materials

• from Radiomuseum.org
• Model: Frenophone amplifying speaker - Brown S. G. Ltd.; London

• Shape
• Miscellaneous shapes - described under notes.

• Dimensions (WHD)
• 25 x 13.25 x 10.25 inch / 635 x 337 x 260 mm

• Notes
• 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)

• Mentioned in
• Radio! Radio! (fig.829)

• Other Models

• Here you find 52 models, 42 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Brown S. G. Ltd.; London