• Country
• United States of America (USA)

• Manufacturer / Brand
• Operadio Corp.; St. Charles (IL)

• Year
• 1948

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 133435

• • alternative name: Operadio Mfg,

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

• Number of Tubes
• 6

• Valves / Tubes
• 6J7 6J7 6SL7GT 6V6GT 6V6GT 5Y3GT

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 110-120 Volt

• Loudspeaker
• - This model requires external speaker(s).

• from Radiomuseum.org
• Model: 1A140 - Operadio Corp.; St. Charles IL

• Shape
• Tablemodel, low profile (big size).

• Notes
• Operadio 1A140;
  AF Amplifier, mic & phono in, tone control.

• Mentioned in
• Photofact Folder, Howard W. SAMS (Vol.5/48 4816-17 Set 46 Folder 17)

• Author
• Model page created by a member from A. See "Data change" for further contributors.

• Other Models

• Here you find 66 models, 43 with images and 32 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Operadio Corp.; St. Charles (IL)