Frenophone amplifying speaker
Brown S. G. Ltd.; London
- País
- Gran Bretaña (GB)
- Fabricante / Marca
- Brown S. G. Ltd.; London
- Año
- 1923
- Categoría
- Altavoz, cascos o auricular
- Radiomuseum.org ID
- 104229
- Gama de ondas
- - no hay
- Tensión de funcionamiento
- No necesita alimentación
- Altavoz
- Corneta
- Material
- Materiales diversos
- de Radiomuseum.org
- Modelo: Frenophone amplifying speaker - Brown S. G. Ltd.; London
- Forma
- Formas varias descritas en notas aparte.
- Ancho, altura, profundidad
- 25 x 13.25 x 10.25 inch / 635 x 337 x 260 mm
- Anotaciones
- 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)
- Mencionado en
- Radio! Radio! (fig.829)
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