Columbus 38

Columbus (Brand); Radio Centre Ltd.; Wellington

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  • Year
  • 1937/1937
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 163501

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 456 kHz; 2 AF stage(s)
  • Tuned circuits
  • 7 AM circuit(s)
  • Wave bands
  • Broadcast plus 2 Short Wave bands.
  • Power type and voltage
  • Alternating Current supply (AC) / 225-250 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Power out
  • 3 W (undistorted)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Columbus 38 - Columbus Brand; Radio Centre
  • Shape
  • Tablemodel, Tombstone = decorative upright, not cathedral but can have rounded edges.
  • Notes

  • All-Wave Receiver with Spotlight SpiralTuning Dial and "Magic Eye" tuning. 

    The Spotlight Spiral Tuning Dial design is quite unique and at first glance it seems like having an effectively very long dial scale of around 2 feet or 600mm and seemed like a really good idea but the dial mechanism was very complex and quite fiddly including pulleys, levers, two custom aluminium plates separated by black paper, a rubber drive belt and tensioner, a dial chain (in place of the usual cord), a dual-speed vernier drive and meshed gears. This dial 'spreading' idea was obsoleted by the advent of bandspreading in the model 75 a couple of years later.

     

  • Price in first year of sale
  • 32.50 NZ £
  • Circuit diagram reference
  • Australian Official Radio Service Manual Vol. I
  • Mentioned in
  • -- Original prospect or advert (Poverty Bay Herald 7 November 1938 Page 15 (Supplement))
  • Author
  • Model page created by Stuart Irwin. See "Data change" for further contributors.

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