Columbus 75 Console

Columbus (Brand); Radio Centre Ltd.; Wellington

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  • Year
  • 1940–1942
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 344174

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) / 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 75 [Console] - Columbus Brand; Radio Centre
  • Shape
  • Console with any shape - in general
  • Dimensions (WHD)
  • 720 x 920 x 340 mm / 28.3 x 36.2 x 13.4 inch
  • Notes

  • 7-Valve (including magic eye) superhet with RF stage.

    • 550 - 1.600 kHz broadcast
    • 17.540 - 18.440 kHz 16 metre band
    • 15.060 - 15.520 kHz 19 metre band
    • 11.400 - 12.120 kHz 25 metre band
    • 9.460 - 9.820 kHz 31 metre band

    The original valve line up was changed within a few months and then changed again the following year (1941). The valve line ups 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 Convoy console, Columbus 75 Table & Courtenay 75.

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

  • Literature/Schematics (1)
  • -- Original-techn. papers. (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.

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