• Country
• United States of America (USA)

• Manufacturer / Brand
• Firestone Tire & Rubber Co. (Air Chief & Roamer, Airchief); Akron (OH)

• Year
• 1952 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 358764

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

• Number of Tubes
• 5

• Valves / Tubes
• 1U4 or 1T4 1R5 1U4 or 1T4 1U5 3V4

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

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• AC/DC-set / AC/DC 117V =110-120/ 90 & 9 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5 inch = 12.7 cm

• Material
• Various materials

• from Radiomuseum.org
• Model: 4-C-21 - Firestone Tire & Rubber Co.

• Shape
• Book-shelf unit.

• Notes

• Firestone model 4-C-21 is a three power portable AM superheterodyne receiver.

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Set 185, folder 7, dated 11-52)

• Author
• Model page created by Dirk Taekels. See "Data change" for further contributors.

• Other Models

• Here you find 480 models, 313 with images and 439 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Firestone Tire & Rubber Co. (Air Chief & Roamer, Airchief); Akron (OH)