• Country
• Great Britain (UK)

• Manufacturer / Brand
• General Radio Co. Ltd.; London

• Year
• 1922

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

• Radiomuseum.org ID
• 70571

• Main principle
• Crystal or Solid State Detector

• Tuned circuits
• 1 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• No Power needed

• Loudspeaker
• - For headphones or amp.

• from Radiomuseum.org
• Model: GRC4 - General Radio Co. Ltd.; London

• Dimensions (WHD)
• 11.2 x 6 x 7 inch / 284 x 152 x 178 mm

• Notes

• two peep holes to the crystal: one for light, one to view; GPO No.132.

• External source of data
• Konrad Birkner

• Mentioned in
• Radio! Radio!

• Literature/Schematics (1)
• Tickling the Crystal; Sanders (vol.3; p.133)

• Author
• Model page created by Konrad Birkner † 12.08.2014. See "Data change" for further contributors.

• Other Models

• Here you find 15 models, 9 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from General Radio Co. Ltd.; London