All Transistor "Valiant" 680 Series

• Country
• United States of America (USA)

• Manufacturer / Brand
• Bulova Watch Corp.; Woodside (NY)

• Year
• 1959 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 70298

• Picture
• Schematics

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

• Number of Transistors
• 4

• Semiconductors
• 2N412 or. 2N486 2N410 or. 2N483 21-20 2N408 or. 2N631

• 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 / 1 x 9 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: All Transistor "Valiant" 680 Series - 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)

• Price in first year of sale
• 29.95 USD

• Circuit diagram reference
• Beitman Radio Diagrams Vol. 20, 1960

• Literature/Schematics (1)
• Transistor Radios 1954-68 (Model info and picture on page 20)

• Author
• Model page created by Trev Levick. See "Data change" for further contributors.

• Other Models

• Here you find 151 models, 131 with images and 50 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Bulova Watch Corp.; Woodside (NY)