• Country
• United States of America (USA)

• Manufacturer / Brand
• Sleeper Radio Corp.; New York (NY)

• Year
• 1924 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 197056

• Number of Tubes
• 3

• Valves / Tubes

• Main principle
• TRF with regeneration; Reflex

• Wave bands
• Broadcast and LongWave in ONE range.

• Power type and voltage
• Storage and/or dry batteries

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: Monotrol 51 - Sleeper Radio Corp.; New York

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Notes
• Has a plaque that says: Sleeper Inverse Duplex. For reception distance of 500 km. One single tuning knob, one knob for detector and another for amplifiers. To be used without need for earth or external antenna by using the Sleeper Monotrol Loop antenna.

• Mentioned in
• Revista Telegráfica - Abril 1924

• Author
• Model page created by Javier Albinarrate. See "Data change" for further contributors.

• Other Models

• Here you find 36 models, 22 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sleeper Radio Corp.; New York (NY)