• Year
  • 1961
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 107391
    • alternative name: Asahi Radio Mfg. Co., Ltd

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

 Technical Specifications

  • Number of Transistors
  • 6
  • Main principle
  • Superheterodyne (common); ZF/IF 455 kHz; 2 AF stage(s)
  • Tuned circuits
  • 5 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Dry Batteries / 2 x 1.5 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5.7 cm = 2.2 inch
  • Power out
  • 0.1 W (unknown quality)
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: TR-680 - Crown Radio Corp.; Tokyo
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Dimensions (WHD)
  • 65 x 90 x 30 mm / 2.6 x 3.5 x 1.2 inch
  • Notes
  • This model TR-680 was also distributed by other brands, like for instance here by SEMP, Brasilia.

    Note: The attached schematic has been corrected to show a Hitachi HV15 diode instead of a direct connection to ground.

  • Net weight (2.2 lb = 1 kg)
  • 0.2 kg / 0 lb 7 oz (0.441 lb)
  • Literature/Schematics (1)
  • Transistor Radios (by David R. Lane & Robert A. Lane. p. 38)
  • Author
  • Model page created by Peter Hoddow. See "Data change" for further contributors.

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