A78RG

Murphy Radio Ltd.; Welwyn Garden City

Datos
Foro
Imágenes
Colecciones

  • Año
  • 1939/1940
  • Categoría
  • Radio - o Sintonizador pasado WW2
  • Radiomuseum.org ID
  • 171103

Haga clic en la miniatura esquemática para solicitarlo como documento gratuito.

 Especificaciones técnicas

  • Numero de valvulas
  • 12
  • Principio principal
  • Superheterodino con paso previo de RF; ZF/IF 465 kHz; 2 Etapas de AF
  • Número de circuitos sintonía
  • 9 Circuíto(s) AM
  • Gama de ondas
  • OM, OL y más de dos OC
  • Especialidades
  • Tocadiscos con cambiador autom.
  • Tensión de funcionamiento
  • Red: Corriente alterna (CA, Inglés = AC) / 200-250 Volt
  • Altavoz
  • Altavoz electrodinámico (bobina de campo)
  • Potencia de salida
  • 15 W (unknown quality)
  • Material
  • Madera
  • de Radiomuseum.org
  • Modelo: A78RG - Murphy Radio Ltd.; Welwyn
  • Forma
  • Consola baja, patas más cortas del 50%.
  • Anotaciones
  • Design by Eden Minns. Two different RF-stages: On shortwave a SP41 is used as an RF-amplifier, on MW/LW a VP41. SW is restricted to Bandspread-tuning of 13, 16, 19, 21, 31, 41 and 49 m bands plus VHF Band 1 (45 MHz) for television sound only. This was of use only in the London area, but gave very good audio range. Variable selectivity in four stages, giving audio range of 8000, 5000, 4000 and 3000 Hz bandwidth. In the two lower positions, an additional IF valve (VP41) is switched into the circuit, in order to improve gain and selectivity. In the higher positions, noise suppression is automatically introduced. Two LF stages. New alphabetical tuning with stations grouped according to wavebands, individually illuminated. Cathode ray tuning indicator. Wire remote control RA80 with push button tuning giving 2 LW-stations and 4 MW-stations and volume control. Wire up to 12 feet long, winds itself up after use. Record changer with piezo-electric pickup. Handles up to eight mixed 10 or 12 in. records. Loudspeaker specially developed for this model. Acoustic tunnel as in A40RG: Walls around speakers from front to back, dampened by felt. Arrangement should restrict the outlet of sound to an aerea similar to that of the combined areas of the diaphragms of both loudspeakers. Built in tilted upwards and outwards. This arrangement was supposed to give spartial -"stereoscopic" - effect, according to the manufacturer and one contemporary test report. Two chassis used, power and output valves in chassis at the base of the cabinet. Two lids. Cabinet of Bombay rosewood, top thuya burr. Power consumption 220watts Price when new £90. Price change December 1939: £95. PT (Purchase Taxe) payable from October 1940. No surviving A78RG is known.
  • Precio durante el primer año
  • 90.00 GBP
  • Procedencia de los datos
  • - - Manufacturers Literature
  • Mencionado en
  • The Gramophone, 5/1940, S.433f.
  • Autor
  • Modelo creado por Sönke Gäthke. Ver en "Modificar Ficha" los participantes posteriores.

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