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31

31 ; Columbia Phonograph, (ID = 707843) Radio
 
31 ; Columbia Phonograph, (ID = 707844) Radio
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31 ; Columbia Phonograph, (ID = 707843) Radio
Select picture or schematic to display from thumbnails on the right and click for download.
 
Country:  United States of America (USA)
Manufacturer / Brand:  Columbia Phonograph, American / Volta Graphophone Company; USA
alternative name
 
American Graphophone || Columbia Recording
Year: 1931 ? Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 5: 35 or 51 35 or 51 24 47 80
Main principle TRF without regeneration; Screengrid 1926-1935
Tuned circuits 3 AM circuit(s)
Wave bands Broadcast only (MW).
Details
Power type and voltage Alternating Current supply (AC) / 115 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
Power out
from Radiomuseum.org Model: 31 - Columbia Phonograph, American
External source of data Ernst Erb
Circuit diagram reference Rider's Perpetual, Volume 2 = 1932 (Models 1931/1932)


All listed radios etc. from Columbia Phonograph, American / Volta Graphophone Company; USA
Here you find 93 models, 58 with images and 34 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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