- Country
- United States of America (USA)
- Manufacturer / Brand
- Operadio Corp.; St. Charles (IL)
- Year
- 1936
- Category
- Audio Amplifier or -mixer
- Radiomuseum.org ID
- 49906
-
- alternative name: Operadio Mfg,
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Tubes
- 6
- Wave bands
- - without
- Power type and voltage
- Alternating Current supply (AC) / 115 Volt
- Loudspeaker
- Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
- from Radiomuseum.org
- Model: 678A - Operadio Corp.; St. Charles IL
- Notes
- Push-pull af output stage.
- External source of data
- Ernst Erb
- Circuit diagram reference
- Rider's Perpetual, Volume 7 = 1936 and before
- 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)