• Country
• United States of America (USA)

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

• Year
• 1947

• Category
• Car Radio, perhaps also + sound player/recorder

• Radiomuseum.org ID
• 40663

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

• Number of Tubes
• 6

• Valves / Tubes
• 6SK7 6SA7 6SK7 6SQ7 6V6GT 0Z4

• Main principle
• Superhet with RF-stage; ZF/IF 455 kHz; 2 AF stage(s)

• Tuned circuits
• 7 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / 6 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 6 inch = 15.2 cm

• Material
• Metal case

• from Radiomuseum.org
• Model: 4-B-6 Air Chief Code 117-7-PM18 - Firestone Tire & Rubber Co.

• Shape
• Chassis only or for «building in»

• Notes
• Vibrator for +B

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 17 = 1948 and before

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Date 12-47, Set 29, Folder 4719-8)

• Other Models

• Here you find 473 models, 310 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)