• Country
• United States of America (USA)

• Manufacturer / Brand
• Radio Products Manufacturing Co. (RPM); Chicago, IL

• Year
• 1924

• Category
• Radio module pre 1926 (not a part, not a key)

• Radiomuseum.org ID
• 204098

• Number of Tubes
• 1

• Valves / Tubes
• UV200

• Main principle
• Detector with Vacuum Tube (Valve), no tuner

• Wave bands
• - without

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

• Loudspeaker
• - For headphones or amp.

• Material
• Bakelite or Plastics (type unknown)

• from Radiomuseum.org
• Model: RPM Detector Unit No. 300 - Radio Products Manufacturing

• Shape
• Chassis only or for «building in»

• Notes
• The Radio Products Manufacturing RPM No. 300 Detector Unit. This unit includes phone and grid condensers, grid leaks, rheostat, standard tube socket and is adaptable to any circuit. This unit was part of the Radio Products line of breadboard style unit modules.

• Price in first year of sale
• 6.00 $

• Literature/Schematics (1)
• 1924 Central Electric Co. catalog page 38

• Author
• Model page created by Alan Larsen. See "Data change" for further contributors.

• Other Models

• Here you find 23 models, 10 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radio Products Manufacturing Co. (RPM); Chicago, IL