• Country
• United States of America (USA)

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

• Year
• 1948 ??

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 136474

• • alternative name: Operadio Mfg,

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

• Number of Tubes
• 11

• Valves / Tubes
• 6J7 6J7 6J7 6J7 6SN7GT 6L6G 6L6G 6L6G 6L6G 5U4G 5U4G

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 105 - 125 Volt

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

• Material
• Leather / canvas / plastic - over other material

• from Radiomuseum.org
• Model: 1A45 - Operadio Corp.; St. Charles IL

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

• Notes
• 4 channel audio amplifier.

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (title)

• Author
• Model page created by Peter Hoddow. 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)