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S7400-3 ; Firestone Tire & (ID = 722493) Radio
S7400-3 ; Firestone Tire & (ID = 722497) Radio
S7400-3 ; Firestone Tire & (ID = 722499) Radio
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S7400-3 ; Firestone Tire & (ID = 722493) Radio
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Country:  United States of America (USA)
Manufacturer / Brand:  Firestone Tire & Rubber Co. (Air Chief & Roamer, Airchief); Akron (OH)
Year: 1942 ? Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 11: 6SK7 6SA7 6J5 6SK7 6J5 6J5 6SQ7 6SQ7 6V6GT 6V6GT 5Y3G
Main principle Superhet with RF-stage; ZF/IF 455 kHz
Tuned circuits 7 AM circuit(s)
Wave bands Broadcast plus 2 Short Wave bands.
Details Changer (Record changer)
Power type and voltage Alternating Current supply (AC) / 110 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 14 inch = 35.6 cm
Power out
from Model: S7400-3 - Firestone Tire & Rubber Co.
Notes Built in loop antenna. Push-button tuning.
External source of data Ernst Erb
Circuit diagram reference Rider's Perpetual, Volume 13 = 1942 and before
Literature/Schematics (1) Riders 13-27, 28, 29

All listed radios etc. from Firestone Tire & Rubber Co. (Air Chief & Roamer, Airchief); Akron (OH)
Here you find 419 models, 274 with images and 381 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.