• Country
• United States of America (USA)

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

• Year
• 1945–1952 ??

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 303691

• • alternative name: Operadio Mfg,

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

• Number of Tubes
• 6

• Valves / Tubes
• 6N7 6J7 6SL7GT 6V6GT 6V6GT 5V4G

• Main principle
• Audio-Amplification

• Power type and voltage
• Alternating Current supply (AC) / 115 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 12 inch = 30.5 cm

• Power out
• 10 W (undistorted)

• Material
• Wooden case

• from Radiomuseum.org
• Model: 1147-A - Operadio Corp.; St. Charles IL

• Shape
• Miscellaneous shapes - described under notes.

• Dimensions (WHD)
• 21.5 x 16.5 x 15.5 inch / 546 x 419 x 394 mm

• Notes

• Operadio chassis model 1147-A on schematic, device labelled Mills Industries Model M0-1601 (or is it Mo-1601?). Two Jensen P12-S alnico speakers in medium large brown cabinet with handles that splits in half.  For projector audio support. Schematic is 1945, speakers 1951, tubes 1952?

• Literature/Schematics (1)
• -- Schematic

• Author
• Model page created by David Connell. 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)