Columbus 75

Columbus (Brand); Radio Centre Ltd.; Wellington

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  • Year
  • 1940–1942
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 262685

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 - Columbus Brand; Radio Centre
  • Shape
  • Tablemodel, low profile (big size).
  • Dimensions (WHD)
  • 615 x 340 x 282 mm / 24.2 x 13.4 x 11.1 inch
  • Notes

  • 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

    60 W power consumption.

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

    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 Courtenay Model 75.

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

       

  • Source of data
  • -- Collector info (Sammler)
  • Mentioned in
  • -- Original-techn. papers. (RNZ Service Bulletin No. 71 - First Edition Sept. 1940)
  • Author
  • Model page created by a member from A. See "Data change" for further contributors.

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