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670S ; United American (ID = 27589) Radio
670S ; United American (ID = 27590) Radio
670S ; United American (ID = 778814) Radio
670S ; United American (ID = 778815) Radio
670S ; United American (ID = 2378149) Radio
670S ; United American (ID = 704105) Radio 670S ; United American (ID = 2378390) Radio
670S ; United American (ID = 2378389) Radio
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670S ; United American (ID = 704105) Radio
United American: 670S [Radio] ID = 704105 424x699
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For model 670S, United American Bosch (Magneto Corporation); Springfield (MA):
Image Courtesy of Mark V. Stein for use only.
Country:  United States of America (USA)
Manufacturer / Brand:  United American Bosch (Magneto Corporation); Springfield (MA)
alternative name
American Bosch Magneto
Year: 1936 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 9: 6K7 6C5 6A8 6K7 6H6 6F5 6F6 or 6F6G 6F6 or 6F6G 5Y3 or 5Z4
Main principle Superhet with RF-stage; ZF/IF 465 kHz
Tuned circuits 7 AM circuit(s)
Wave bands Broadcast, Long Wave and 2 x Short Wave.
Power type and voltage Alternating Current supply (AC) / 115 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
Power out 4.5 W (unknown quality)
from Model: 670S - United American Bosch Magneto
Material Wooden case
Shape Console with any shape - in general
Price in first year of sale 120.00 $
External source of data E. Erb 3-907007-36-0
Source of data -- Original prospect or advert
Circuit diagram reference Die «Thali Schemasammlung» führt das Modell.
Mentioned in Pre-War Consoles
Literature/Schematics (1) Rider's Perpetual, Volume 7 = 1936 and before (Riders 7-39, 41, 42 ; 9-6)
Literature/Schematics (2) Collector's Guide to Antique Radios (7th Edition)

All listed radios etc. from United American Bosch (Magneto Corporation); Springfield (MA)
Here you find 413 models, 159 with images and 268 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.