• Country
• United States of America (USA)

• Manufacturer / Brand
• Allied Radio Corp. (Knight, Roamer, Wextark); Chicago (IL)

• Year
• 1959 ?

• Category
• Morse-Equipment & TTY, RTTY, TDD etc.

• Radiomuseum.org ID
• 330279

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

• Number of Transistors
• 1

• Semiconductors
• CK722

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Dry Batteries / AA: 1 x 1.5 Volt

• Loudspeaker
• - only for Earphone!

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Knight-kit Transistor Code Practice Oscillator 83Y239 - Allied Radio Corp. Knight,

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 2.375 x 3.75 x 1.5 inch / 60 x 95 x 38 mm

• Notes

• The Allied Knight-kit Transistor Code Practice Oscillator (CPO) model 83Y239 uses the famous CK-722 in a blocking oscillator circuit.  The CPO requires a high impedance headphone and a code key for proper operation.

• Price in first year of sale
• 3.95 USD

• Mentioned in
• Allied Radio Catalog (Knight) (1960)

• Author
• Model page created by Rich Post. See "Data change" for further contributors.

• Other Models

• Here you find 1035 models, 638 with images and 679 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Allied Radio Corp. (Knight, Roamer, Wextark); Chicago (IL)