207

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

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  • Année
  • 1941 ?
  • Catégorie
  • Radio - ou tuner d'après la guerre 1939-45
  • Radiomuseum.org ID
  • 299007
    • alternative name: CMC Canada || Marconi, Canada

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 Spécifications techniques

  • No. de tubes
  • 7
  • Principe général
  • Super hétérodyne avec étage HF; FI/IF 462.5 kHz; 2 Etage(s) BF
  • Circuits accordés
  • 7 Circuits MA (AM)
  • Gammes d'ondes
  • PO et plus que 2 x OC
  • Tension / type courant
  • Alimentation Courant Alternatif (CA) / 115 Volt
  • Haut-parleur
  • HP dynamique à électro-aimant (électrodynamique) / Ø 12 inch = 30.5 cm
  • Puissance de sortie
  • 3.5 W (8.5 W max.)
  • Matière
  • Boitier en bois
  • De Radiomuseum.org
  • Modèle: 207 - Canadian Marconi Co. Ltd. CMC,
  • Forme
  • Console avec des boutons-poussoirs
  • Remarques

  • 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
  • Auteur
  • Modèle crée par Tom Seeger. Voir les propositions de modification pour les contributeurs supplémentaires.

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Contributions du forum pour ce modèle: Canadian Marconi Co.: 207

Discussions: 1 | Publications: 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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