• Country
• United States of America (USA)

• Manufacturer / Brand
• Hetro Electrical Industries; Chicago, IL

• Year
• 1938 ??

• Category
• Radio module post 1925 (not a part, not a key)

• Radiomuseum.org ID
• 44291

Click on the schematic thumbnail to request the schematic as a free document.

• Main principle
• RF Converter/Adapter (not voltage converter)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• No Power needed

• Loudspeaker
• - For headphones or amp.

• from Radiomuseum.org
• Model: Tuners A, B - Hetro Electrical Industries;

• Notes
• Six BC station push-button selectors add-on for various Hetro Electrical models.

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 9 = 1938 and before

• Other Models

• Here you find 79 models, 5 with images and 74 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hetro Electrical Industries; Chicago, IL