Variable Air Capacitors

Colmovox (Brand), Colville-Moore Wireless Supplies Ltd.; Sydney NSW

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  • Year
  • 1924
  • Category
  • Radio part (not a module) 
  • Radiomuseum.org ID
  • 328183

 Technical Specifications

  • Wave bands
  • - without
  • Material
  • Various materials
  • from Radiomuseum.org
  • Model: Variable Air Capacitors - Colmovox Brand, Colville-Moore
  • Shape
  • Miscellaneous shapes - described under notes.
  • Notes

  • Variable Capacitors (Condensers)

    Colville-Moore Wireless Supplies Ltd., manufactured a range of variable capacitors from 1924.

    VARIABLE AIR CONDENSERS

    THE HEART OF THE TUNING UNIT

    Effective Tuning is only possible with the condenser of Low Radio Frequency Resistance.

    TYPE 558, VARIABLE AIR CONDENSER. — A better class highly efficient and inexpensive condenser for the radio experimenter.

    ENDS: MOULDED BAKELITE. —Brass bushed ends.

    PLATES: HEAVY ALUMINIUM PLATES. — Eccentric in design, providing an extremely gradual variation in capacity, and making this instrument suitable for accurate calibration or wave-meter work.

    CONTACT: POSITIVE SPRING CONTACT. — Ensuring perfect connections, with movable plates.

    SPINDLES: TURNED.— ¼in. brass spindle.

    FINISH: NICKEL PLATED.—Brass and aluminium finish.

    VERNIER, TYPE 55B, is equipped with a three (3) plate attachment, allowing minute capacity variations for fine tuning.

    Type 55B- Approx. Capacities Price Vernier
    3 .000075 8/6  
    5 .00015 10/-  
    13 .0003 12/- 20/-
    3 .00055 15/- 23/-
    43 .001 20/- 28/-

    TYPE 77.—A highly efficient variable air condenser, of rugged construction. Similar in characteristics of type 55, except that the end plates are of heavy aluminium, hard rubber Bushed. Panel mounting by one hole, similar to telephone jack. In two capacities only.

    TYPE 77A—23 Plate Capacity, approximately 550 M.M.F. (.00055 M.F.) 12/-

    TYPE 77A—43 Plate Capacity, Approximately 1000 M.M.F. (.001 M.F.)   15/-

     

     

  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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