204A (chassis only)

Sentinel Radio Corp., Evanston, Illinois

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  • Year
  • 1939/1940
perfect model
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 57488

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

 Technical Specifications

  • Number of Tubes
  • 5
  • Main principle
  • Superheterodyne (common); ZF/IF 455 kHz
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Alternating Current supply (AC) / see text, normally 50 cycles, 115 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: 204A - Sentinel Radio Corp., Evanston
  • Shape
  • Chassis only or for «building in»
  • Notes

  • Some models with 6U5 tuning eye. 5 or 8 inch speaker. The Sentinel chassis 204-A have the same schematic but different cabinets. Assumptions for the suffixes: 204-A (not sure if this is only the chassis name, no cabinet, A probably for AC), 204-AT (T for table), 204-ACE-CB (C for console, E for magic eye, CB fro record player), 204-ACT (C = console, T = tall) and 204-AE (E for magic eye). Tuning is broadcast 540 to 1730 kHz, automatic volume control (AVC). 3.5 Watt power output. The same line exists as 206-A chassis with the same cabinets but the chassis provides additional short waves 5.7 to 18.3 MHz - see for instance 206-AT.
    * Models can have a different power transformer:  11272 (39) for 115 volts 50 cycles, 11273 (40) 115 volts 25 cycles, 11719 (41) 110 - 230 volts, 50 cycles or 11721 (42) for 220 volts, 50 cycles. Models -CB are "combinations" with phonograph. See 204ATE-CB, 204ACE-CB (and 198ACE-CB).

  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 11 = ca. 1940 and before

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