Variable Inductor 107K

General Radio Company; Cambridge (MA)

  • Year
  • 1946 ?
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 121415
    • alternative name: GenRad

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

 Technical Specifications

  • Wave bands
  • - without
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Variable Inductor 107K - General Radio Company;
  • Shape
  • Tablemodel, high profile (upright - NOT Cathedral nor decorative).
  • Dimensions (WHD)
  • 6.5 x 8.75 x 6.5 inch / 165 x 222 x 165 mm
  • Notes
  • The General Radio 107K is a variable inductor. The model consists of two coils, a rotor and a stator, which are mounted concentrically.  As the position of the rotor is changed, the coupling between the two coils changes, thus causing the inductance to vary.  The total inductance range is over 25:1. The maximum power is 15W.

    Separate terminals are brought out for both the rotor and the stator so that they may be connected in series or in parallel as a self-inductor, or used separately as a mutual inductor.

    The 107 was available in 5 different versions, each covering a different range of inductances:

    Model Mutual Inductance DC Resistance Self-Inductance (Series) Self-Inductance (Parallel)
    107-J 0 - 10.8 uh 0.05 ohms 8 - 50 uh 2 - 12.5 uh
    107-K 0 - 110 uh 0.38 ohms 80 - 500 uh 20 - 125 uh
    107-L 0 - 1.1 mh 4.6 ohms 0.8 - 5 mh 0.2 - 1.25 mh
    107-M 0 - 11 mh 32 ohms 8 - 50 mh 2 - 12.5 mh
    107-N 0 - 110 mh 410 ohms 80 - 500 mh 20 - 125 mh

     

  • Net weight (2.2 lb = 1 kg)
  • 5 lb (5 lb 0 oz) / 2.270 kg
  • Author
  • Model page created by Rudolf Osterkamp. See "Data change" for further contributors.

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