• Country
• United States of America (USA)

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

• Year
• 1937/1938

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 202582

• • alternative name: Operadio Mfg,

• Number of Tubes
• 12

• Valves / Tubes

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC)

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

• Power out
• 55 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: 855 - Operadio Corp.; St. Charles IL

• Shape
• Tablemodel, slant panel.

• Notes
• Beam Amplifier - Model 855; six stages; four channel input volume expansion; volume compression; electronic visual overload and output indicator. Resonant equalizer use as tone balancer for both high and low frequencies; twelve tubes.

• Price in first year of sale
• 180.00 $

• Source of data
• Radio Retailing (Radio & Television R.)

• Author
• Model page created by Heiko zur Mühlen. 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)