Frenophone amplifying speaker
Brown S. G. Ltd.; London
- Land
- Grossbritannien (UK)
- Hersteller / Marke
- Brown S. G. Ltd.; London
- Jahr
- 1923
- Kategorie
- Lautsprecher, Kopfhörer oder Ohrhörer
- Radiomuseum.org ID
- 104229
- 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)
- Literaturnachweis
- Radio! Radio! (fig.829)
- Weitere Modelle
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Hier finden Sie 54 Modelle, davon 44 mit Bildern und 3 mit Schaltbildern.
Alle gelisteten Radios usw. von Brown S. G. Ltd.; London