• Year
  • 1959 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 70298

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

 Technical Specifications

  • Number of Transistors
  • 4
  • Main principle
  • ZF/IF 455 kHz; 3 AF stage(s); Reflex
  • Tuned circuits
  • 4 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Dry Batteries / 9 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: 680 - Bulova Watch Corp.; Woodside
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Dimensions (WHD)
  • 103 x 164 x 50 mm / 4.1 x 6.5 x 2 inch
  • Notes
  • Unusual circuit design: Vol-pot in front of mixer/oscillator transistor.  Active IFdetector (with AF amplification), reflex IF stage as emitter-follower for AF, single ended output stage.

  • Net weight (2.2 lb = 1 kg)
  • 0.605 kg / 1 lb 5.3 oz (1.333 lb)
  • Circuit diagram reference
  • Beitman Radio Diagrams Vol. 20, 1960
  • Author
  • Model page created by Trev Levick. See "Data change" for further contributors.

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The model 680 is part of the collections of the following members.

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