• Year
  • 1937–1939 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 286219
    • alternative name: National Toy Co.
    • Brand: Thrillbox

 Technical Specifications

  • Main principle
  • TRF without regeneration
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Powered by external power supply or a main unit.
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: High Fidelity TRF Unit - National Company; Cambridge &
  • Shape
  • Rack
  • Dimensions (WHD)
  • 0 x 3.5 x 0 inch / 0 x 89 x 0 mm
  • Notes
  • The National High Fidelity TRF Unit is a single signal receiver. It was available as a kit. There are three models, covering the ranges of 540-875 KHz, 740-1230 KHz, and 1100-1700 KHz. Customers could choose the one frequency in the range that they desired. National recommended using four, or more, of these receivers, set to different frequencies, and using a push switch or relay system to select between the stations.

    The following components make up the unit: DLC (drilled only) or DLCA (drilled with sockets and terminals) chassis, DLPS (1/8-inch steel) or DLPA (3/16-inch aluminum) panel, and DLT transformers (four required per unit). 

  • Mentioned in
  • National Catalog No. 280 - 1938
  • Author
  • Model page created by Wayne Childress. See "Data change" for further contributors.

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