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S7425-3 ; Firestone Tire & (ID = 725697) Radio
S7425-3 ; Firestone Tire & (ID = 725698) Radio
S7425-3 ; Firestone Tire & (ID = 725699) Radio
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S7425-3 ; Firestone Tire & (ID = 725697) Radio
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Country:  United States of America (USA)
Manufacturer / Brand:  Firestone Tire & Rubber Co. (Air Chief & Roamer, Airchief); Akron (OH)
Year: 1938 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 5: 6A8G 6U7G 6Q7G 6K6G 6X5G
Main principle Super-Heterodyne (Super in general); ZF/IF 455 kHz
Tuned circuits 6 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 Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 7 inch = 17.8 cm
Power out
from Model: S7425-3 - Firestone Tire & Rubber Co.
Shape Tablemodel with Push Buttons.
Notes Farm radio. Vibrator for +B.
External source of data Ernst Erb
Circuit diagram reference Rider's Perpetual, Volume 11 = ca. 1940 and before
Literature/Schematics (1) Riders 11-19, 20, 21

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.