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Duo Dynamic Speaker

Duo Dynamic Speaker ; Electrical Research (ID = 1355184) Speaker-P Duo Dynamic Speaker ; Electrical Research (ID = 1355186) Speaker-P
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Duo Dynamic Speaker ; Electrical Research (ID = 1355184) Speaker-P
Electrical Research: Duo Dynamic Speaker [Speaker-P] ID = 1355184 932x838
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For model Duo Dynamic Speaker, Electrical Research Laboratories Inc. (Erla); Chicago, Illinois:
Scanned from the radio Retailing October 1928 page 42
 
Country:  United States of America (USA)
Manufacturer / Brand:  Electrical Research Laboratories Inc. (Erla); Chicago, Illinois
Year: 1928 Category: Loudspeaker, headphone or earphone
Wave bands - without
Details
Power type and voltage Powered by external power supply or a main unit.
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
Power out
from Radiomuseum.org Model: Duo Dynamic Speaker - Electrical Research
Material Metal case
Shape Chassis only or for «building in»
Notes

Different voltages:

110 V AC : $42.50

 6 V DC : $30.00

110 V DC : $35.00

 

Source of data Radio Retailing (Radio & Television R.)

Model page created by Heiko zur Mühlen. See "Data change" for further contributors.



All listed radios etc. from Electrical Research Laboratories Inc. (Erla); Chicago, Illinois
Here you find 131 models, 45 with images and 61 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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