• Country
• United States of America (USA)

• Manufacturer / Brand
• Columbia Radio Co.; Youngstown Ohio

• Year
• 1930

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 35695

• • Brand: Sentinel

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 9

• Valves / Tubes
• 24 24 24 24 27 27 45 45 80

• Main principle
• TRF without regeneration; Screengrid 1926-1935

• Tuned circuits
• 4 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Alternating Current supply (AC) / 110 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• Material
• Wooden case

• from Radiomuseum.org
• Model: SG-9 AC-9-30 [1930] - Columbia Radio Co.; Youngstown

• Shape
• Console, Lowboy (legs < 50 %).

• Notes

• Push-pull af output stage.
  Also found under "Allied Radio Corp." model SG-9.

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 3 = 1933 and before

• Other Models

• Here you find 9 models, 4 with images and 4 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Columbia Radio Co.; Youngstown Ohio