Bruno 99 Tuner

Wholesale Wireless Co. Ltd.; London

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  • Year
  • 1925 ?
  • Category
  • Radio part (not a module) 
  • Radiomuseum.org ID
  • 355491

 Technical Specifications

  • Main principle
  • RF-Circuit or wave trap (separate, can also be an antenna with amp.)
  • Wave bands
  • Short Wave (SW only)
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Various materials
  • from Radiomuseum.org
  • Model: Bruno 99 Tuner - Wholesale Wireless Co. Ltd.;
  • Shape
  • Miscellaneous shapes - described under notes.
  • Notes

  • The "Bruno" 99 Tuner, marketed by Wholesale Wireless Co., underwent testing by The Wireless Engineer with good results.

    Designed for shortwave reception (20-100 meters), it utilizes three specially wound coils:

    • Untuned aerial coil (aluminum, 12 turns)
    • Fixed-coupled secondary coil (copper or phosphor-bronze, 4 turns)
    • Rotatable reaction coil within the secondary (15 turns)

    The coils are wound on quartzite rods supported by ebonite rings, with connection terminals attached. The aerial coil is spaced about ½" from the secondary coil.
    Tests focused solely on the secondary coil, revealing:

    • Inductance: 10.9 µH
    • H.F. resistance: 0.9 ohm
    • Self-capacity: 2.5 pF

    To estimate the tuning range, calculations considered a minimum capacitance of 20pF for a variable condenser and connecting leads. This translates to a minimum wavelength of 27 meters and a maximum of 102 meters.

  • Price in first year of sale
  • 1.80 GB £
  • Mentioned in
  • -- Original prospect or advert (Wireless Engineer Nov 1925, Page 883.)
  • Literature/Schematics (1)
  • -- Original prospect or advert (Wireless Constructor Nov 1925, Page 102.)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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