• Year
  • 1929 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 116691
    • Brand: Sentinel

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

 Technical Specifications

  • Number of Tubes
  • 9
  • Main principle
  • TRF without regeneration; Screengrid 1926-1935
  • Tuned circuits
  • 4 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Alternating Current supply (AC)
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • from Radiomuseum.org
  • Model: 660 - United Air Cleaner Corp. - see
  • Notes
  • Not to be confused with the Sentinel model 660 from 1934, a 5-tube superhet.

    One dial (primary tuning control knob).

  • Circuit diagram reference
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)
  • Mentioned in
  • -- Original-techn. papers. (“Official Radio Service Manual” 1930, Editor Hugo Gernsback, reprinted 1984 by Vestal Press.)

 Collections | Museums | Literature

 Forum