Duet 81

Amrad Corporation; Medford Hillside (MA)

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  • Year
  • 1929
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 32620
    • alternative name: American Radio & Research

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

 Technical Specifications

  • Number of Tubes
  • 8
  • Main principle
  • TRF without regeneration; 2 AF stage(s); Screengrid 1926-1935
  • Tuned circuits
  • 4 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Details
  • Record Player (perh.Changer)
  • Power type and voltage
  • Alternating Current supply (AC) / 110; 120 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Duet 81 - Amrad Corporation; Medford
  • Shape
  • Console, Lowboy (legs < 50 %).
  • Notes

  • One dial (primary tuning control knob). Amrad made the chassis 81 for models Duet (radio-phono low boy modern console with inlay, inner dial and escutcheon, large double doors, stretcher base, sold for $ 495), Serenata (high boy console with stretcher base, double doors, $ 245), Symphony (Art Modern high boy console, inner front dial, double doors, stretcher base, $ 295), Minuet (console $ 158), Aria (low boy, radio-phono $ 198) and Bel Canto (low boy console $ ?) with the same schematic. The original tube line up was made with the then new UY-224 (no shoulder), the UY-227 (from 1927), the new UX-245 and the UX-280. Later those tubes became a shoulder and were called with two digits only like 24A, 27, 45 and 80. We try to give the original tube line up.

  • Price in first year of sale
  • 495.00 $
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)
  • Literature/Schematics (3)
  • Amrad Folder C.B.3 for 1929.

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