207

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

Data
Forum
Pictures
Collections

  • Year
  • 1941 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 299007
    • alternative name: CMC Canada || Marconi, Canada

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 7
  • Main principle
  • Superhet with RF-stage; ZF/IF 462.5 kHz; 2 AF stage(s)
  • Tuned circuits
  • 7 AM circuit(s)
  • Wave bands
  • Broadcast plus more than 2 Short Wave bands.
  • Power type and voltage
  • Alternating Current supply (AC) / 115 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 12 inch = 30.5 cm
  • Power out
  • 3.5 W (8.5 W max.)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 207 - Canadian Marconi Co. Ltd. CMC,
  • Shape
  • Console with Push Buttons.
  • Notes

  • 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
  • Author
  • Model page created by Tom Seeger. See "Data change" for further contributors.

 Collections | Museums | Literature

 Forum

Forum contributions about this model: Canadian Marconi Co.: 207

Threads: 1 | Posts: 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

Weitere Posts (2) zu diesem Thema.