Columbus Convoy 75

Columbus (Brand); Radio Centre Ltd.; Wellington

Data
Forum
Pictures
Collections

  • Year
  • 1940–1942
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 352526

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 455 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) / 50Hz, 230 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 10 inch = 25.4 cm
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Columbus Convoy 75 - Columbus Brand; Radio Centre
  • Shape
  • Console with any shape - in general
  • Notes

  • Columbus 75 Convoy 7-Valve (including magic eye) superhet with RF stage console receiver.

    Wavebands:

    • MW: 550 - 1.600 kHz broadcast
    • SW4: 17.540 - 18.440 kHz 16 metre band
    • SW3: 15.060 - 15.520 kHz 19 metre band
    • SW2: 11.400 - 12.120 kHz 25 metre band
    • SW1: 9.460 - 9.820 kHz 31 metre band

    The original valve lineup was changed within a few months and then changed again the following year (1941). The valve lineups used were:

    • 6K7G 6K8G 6K7G 6B8G 6U5 6F6G 5Z4G. 
    • KTW61 X65 6K7G 6B8G Y63 6F6G U50.  
    • KTW61 X65 6B8G 6J7 Y63 6F6G U50.

    This model is believed to be the first domestic bandspread receiver in the world after the RCA HF2/HF4.

    See also Columbus 75 Console (different cabinet model), Columbus 75 Mantel & Courtenay 75 Mantel.

    Manufactured by Radio Corporation Of New Zealand Ltd for Columbus Radio Centre Ltd.

  • Literature/Schematics (1)
  • -- Original-techn. papers. (RNZ Service Bulletin No. 71 - First Edition Sept. 1940.)
  • Author
  • Model page created by Brian Stevens. See "Data change" for further contributors.

 Collections | Museums | Literature

 Forum