• Country
• Great Britain (UK)

• Manufacturer / Brand
• Marconi's Wireless Telegraph Co. Ltd.

• Year
• 1912 ??

• Category
• Detector-Radio (Crystal or diode, without tubes/transistors)

• Radiomuseum.org ID
• 326270

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

• Main principle
• Crystal or Solid State Detector

• Tuned circuits
• 1 AM circuit(s)

• Wave bands
• Broadcast only (MW).

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: Crystal Receiver Type No. 20 - Marconi's Wireless Telegraph

• Shape
• Tablemodel, with any shape - general.

• Notes

• Receiver utilizing single carborundum crystal. A potentiometer allows for adjustment of the the detector voltage. The set requires high resistance headphones.

  The No. 20 receiver is associated with the Marconi 1 1/2kW shipboard spark station. The multiple tuner of the station would be used either with the magnetic detector, or with the crystal receiver.

• Mentioned in
• Hawkhead: Handbook of Technical Instruction for Wireless Telegraphists, 2nd ed. (1915)

• Author
• Model page created by Nikolaus Löwe. See "Data change" for further contributors.

• Other Models

• Here you find 94 models, 92 with images and 17 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Marconi's Wireless Telegraph Co. Ltd.