Columbus 5A

Columbus (Brand); Radio Centre Ltd.; Wellington

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  • Year
  • 1951 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 304547

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

 Technical Specifications

  • Number of Tubes
  • 5
  • Main principle
  • Superheterodyne (common); 2 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Alternating Current supply (AC) / 50Hz, 230 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 5 inch = 12.7 cm
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Columbus 5A - Columbus Brand; Radio Centre
  • Shape
  • Tablemodel without push buttons, Mantel/Midget/Compact up to 14
  • Notes

  • Columbus Model 5A

    The model 5 series was in production for a few years and was released in four different variants with two valve lineups.  The models were the 5, 5A, 5B and 5M.

    The model 5 was originally specified to use an octal 6K6** output valve, although its likely that most have a 6V6.  There is also a release note stating it would most likely change to be a 6AQ5 in time.  It also showed an octal 6X5GT rectifier.  All subsequent models have a full miniature valve lineup.  The early schematic showing octal output and rectifier valves has no date or drawing number and may be a draft drawing, or an unofficial release to meet requests from service departments around the country.  A subsequently released 'Model 5' drawing dated August 1951, almost a year after the release note, shows all miniature valves.  Its unclear if RCNZ was referring to the original model 5 or all available variants at that time (although not all variants had the shown loop antenna).

    The later versions also had a better spread of the frequency band as can be seen on the dial scales.

    The model 5B has a wider dial, with a narrower speaker grill to compensate, and uses a standard aerial coil rather than the loop aerial the other models have.

  • Author
  • Model page created by Stuart Irwin. See "Data change" for further contributors.

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