Ballantine Variotransformer Model 5

Boonton Rubber Mfg. Co.; Boonton NJ

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  • Year
  • 1923 ?
  • Category
  • Radio part (not a module) 
  • Radiomuseum.org ID
  • 351779

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

 Technical Specifications

  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Various materials
  • from Radiomuseum.org
  • Model: Ballantine Variotransformer Model 5 - Boonton Rubber Mfg. Co.;
  • Notes

  • The Boonton Ballantine Variotransformer Model 5 was a transformer designed for radio frequency passive amplification. Primary and secondary windings are in a stator/rotor configuration, with a single knob that rotates a winding, resulting in an amplified peaked resonant tuned frequency in the 550-1760 kHz range (170-550 meters).

    It was designed by Stuart Ballantine, an engineer with the Radio Frequency Laboratories and manufactured by Boonton Rubber Manufacturing Co. The housing was molded Bakelite, which was a specialty of Boonton.

    US Patent 1,514,416 was filed on Dec. 19, 1922 and granted on Nov. 4, 1924.

    This variotransformer was included in the 1-tube RF Amplifying Unit Model 5.

  • Price in first year of sale
  • 9.60 USD
  • Author
  • Model page created by Jerry Elarton. See "Data change" for further contributors.

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