207

Canadian Marconi Co. Ltd. (CMC, Esterline), Marconi's Wireless; Montreal, QC

Datos
Foro
Imágenes
Colecciones

  • Año
  • 1941 ?
  • Categoría
  • Radio - o Sintonizador pasado WW2
  • Radiomuseum.org ID
  • 299007
    • alternative name: CMC Canada || Marconi, Canada

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

 Especificaciones técnicas

  • Numero de valvulas
  • 7
  • Principio principal
  • Superheterodino con paso previo de RF; ZF/IF 462.5 kHz; 2 Etapas de AF
  • Número de circuitos sintonía
  • 7 Circuíto(s) AM
  • Gama de ondas
  • OM y más de dos OC
  • Tensión de funcionamiento
  • Red: Corriente alterna (CA, Inglés = AC) / 115 Volt
  • Altavoz
  • Altavoz electrodinámico (bobina de campo) / Ø 12 inch = 30.5 cm
  • Potencia de salida
  • 3.5 W (8.5 W max.)
  • Material
  • Madera
  • de Radiomuseum.org
  • Modelo: 207 - Canadian Marconi Co. Ltd. CMC,
  • Forma
  • Consola con botonera.
  • Anotaciones

  • The Canadian Marconi model 206 is a 7-tube console radio with tuning eye tube and pushbutton station selector. Covers the following ranges:

    Band Frequency (kHz)
    Standard Broadcast 540 - 1710
    Shortwave 5860-16030
    31m 9450 - 9750
    25m 11645 - 11965
    19m 15050 - 15400
    Shortwave 17600 - 22040
  • Autor
  • Modelo creado por Tom Seeger. Ver en "Modificar Ficha" los participantes posteriores.

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Contribuciones en el Foro acerca de este modelo: Canadian Marconi Co.: 207

Hilos: 1 | Mensajes: 2

This is my first renovation, and my first post, so I'm a bit reticent in case I have my finding wrong. But I don't think so!

This is the Marocni 207, electrically identical, I believe, to the 206, and I'm looking at R18 / R19 in parallel, which feed voltage to the screen grids of the first & second stages of the RF path. The components list shows these as 2K6, 2W each, to give a combined value of 1K3 at 4W.

In my restoration of serial no. 4511, the parallel pair shows 40K instead of the advertised 1K3. That's a clue! But the resistors themselves have colour coding for 26K, not 2K6. Looking at the specs for these two valves (sorry, I can't get used to calling them "tubes," even though I now live in Canada), it's clear that a value of 1K3 for the resistor pair just doesn't work. 13K is better.

So I'm postulagting that the components list has the values wrong. Does that make sense? If I get agreement, I'll re-post this as information.

I'm finding that antique radio restoration is a combination of detective work, logic, and hard-earned knowledge. I love it!

Alistair Thomson, 25.Nov.18

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