• Country
• United States of America (USA)

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

• Year
• 1936/1937

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 40690

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

• Number of Tubes
• 7

• Valves / Tubes
• 6A8 6K7 6H6 6F5 6G5 6F6 5Z4

• Main principle
• Superheterodyne (common); ZF/IF 456 kHz; 2 AF stage(s)

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast plus 2 Short Wave bands.

• Power type and voltage
• Alternating Current supply (AC) / 110 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 8 inch = 20.3 cm

• Material
• Wooden case

• from Radiomuseum.org
• Model: 7405-3 Air Chief - Firestone Tire & Rubber Co.

• Shape
• Tablemodel, low profile (big size).

• Notes
• Firestone began selling non-automobile radios in the Fall 1936. These radios were normally manufactured by Stewart Warner. The model 7405-1 (4 tubes) is the smallest of the family for 1936/37, followed by 7405-2 (5 tubes) and 7405-3 (7 tubes) in size. The model 7405-3 has a 6 inch illuminated airplane dial. Automatic tone control, "automatic antenna system", bass compensation and power line filter. The model 7405-3 is made in walnut, has 4 knobs and the 6G5 as magic eye (photo-eye-tuner). Price was 42.50 $ for this "7 Tube All Wave".

• External source of data
• Ernst Erb

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

• Other Models

• Here you find 472 models, 307 with images and 430 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)