Code Practice Oscillator CPO

National Company; Cambridge & Malden (MA)

  • Year
  • 1934
  • Category
  • Amateur Equipment (Other, but not Key)
  • Radiomuseum.org ID
  • 285752
    • alternative name: National Toy Co.
    • Brand: Thrillbox

 Technical Specifications

  • Number of Tubes
  • 1
  • Valves / Tubes
  • 30
  • Wave bands
  • - without
  • Power type and voltage
  • Dry Batteries
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case, TUBES VISIBLE
  • from Radiomuseum.org
  • Model: Code Practice Oscillator CPO - National Company; Cambridge &
  • Shape
  • Tablemodel, with any shape - general.
  • Notes
  • The National CPO Code Practice Oscillator is a small audio oscillator suitable for either code practice or as an ICW modulator. It has tip jacks for headphones, an on-off switch and terminals for the key. It uses four flashlight batteries.

  • Price in first year of sale
  • 6.00 USD
  • Mentioned in
  • QST (February 1934 page 82)
  • Literature/Schematics (1)
  • Allied Catalog 1935 page 95
  • Author
  • Model page created by Wayne Childress. See "Data change" for further contributors.

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