• Country
• United States of America (USA)

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

• Year
• 1946/1947

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 40616

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

• Number of Tubes
• 6

• Valves / Tubes
• 12SK7 12SA7 12SF7 12SK7 35L6GT 35Z4GT

• Main principle
• Superhet with RF-stage; ZF/IF 455 kHz

• Tuned circuits
• 7 AM circuit(s)

• Wave bands
• Broadcast and Short Wave (SW).

• Power type and voltage
• AC/DC-set / 110 Volt

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: 4-A-20 - Firestone Tire & Rubber Co.

• Shape
• Tablemodel, with any shape - general.

• Notes
• The Firestone model 4-A-20 is an AC-DC 2-Band Superheterodyne with Self Contained Loop Antenna.

• External source of data
• Ernst Erb

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

• Circuit diagram reference
• Rider's Perpetual, Volume 15 = 1947 and before

• Mentioned in
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Date: Mar 1947, Set 15, Folder 475-11)

• Other Models

• Here you find 479 models, 312 with images and 436 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)