• Country
• United States of America (USA)

• Manufacturer / Brand
• Detrola; Detroit (MI)

• Year
• 1933 ?

• Category
• Pre-stage (adaptor for SW/FM/VHF/UHF incl. built-in), Frequency converter

• Radiomuseum.org ID
• 37402

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

• Number of Tubes
• 3

• Valves / Tubes
• 24 or 51 27 27

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

• Tuned circuits
• 2 AM circuit(s)

• Wave bands
• Wave Bands given in the notes.

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

• Loudspeaker
• - For headphones or amp.

• from Radiomuseum.org
• Model: R300A SW Converter - Detrola; Detroit MI

• Notes
• Converts stations around 75m to BC band. Second 27 connected as diode in power supply.

• External source of data
• Ernst Erb

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

• Other Models

• Here you find 330 models, 192 with images and 287 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Detrola; Detroit (MI)