• Country
• United States of America (USA)

• Manufacturer / Brand
• Sentinel Radio Corp., Evanston, Illinois

• Year
• 1941/1942

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 57525

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

• Number of Tubes
• 5

• Valves / Tubes
• 1R5 1T4 1S5 3S4 35Z3

• Main principle
• Superheterodyne (common); ZF/IF 455 kHz

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Line / Batteries (any type) / 117/67.5/1.5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 3.5 inch = 8.9 cm

• Material
• Bakelite or Plastics (type unknown)

• from Radiomuseum.org
• Model: 247 - Sentinel Radio Corp., Evanston

• Shape
• Portable set > 8 inch (also usable without mains)

• Notes
• Line supply = AC or DC 67.5V =+B 1.5V = filament. - Built in extra loop antenna "SEN-TENNA", that permits reception anywhere - in cars, trains and planes.

• External source of data
• Ernst Erb

• Source of data
• Collector's Guide to Antique Radios 4. Edition

• Circuit diagram reference
• Rider's Perpetual, Volume 16 = ca. 1948 and before

• Mentioned in
• Radio Retailing (Radio & Television R.) (June 1941.)

• Other Models

• Here you find 705 models, 349 with images and 596 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sentinel Radio Corp., Evanston, Illinois