- Country
- United States of America (USA)
- Manufacturer / Brand
- Operadio Corp.; St. Charles (IL)
- Year
- 1927/1928
- Category
- Broadcast Receiver - or past WW2 Tuner
- Radiomuseum.org ID
- 49908
-
- alternative name: Operadio Mfg,
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Tubes
- 7
- Valves / Tubes
- Main principle
- TRF (Tuned-Radio-Frequency but use of regeneration unknown)
- Wave bands
- Broadcast only (MW).
- Power type and voltage
- Dry Batteries
- Loudspeaker
- Horn
- from Radiomuseum.org
- Model: 7 [.] - Operadio Corp.; St. Charles IL
- Shape
- Portable set > 8 inch (also usable without mains)
- Notes
- Price in 1927: 146 $, with power unit 190 $; price in 1928: 112 $. One dial (primary tuning control knob)
- Price in first year of sale
- 146.00 $
- External source of data
- Ernst Erb
- Source of data
- Radio Collector`s Guide 1921-1932
- Circuit diagram reference
- Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)
- 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)