• Country
• Great Britain (UK)

• Manufacturer / Brand
• Harding, Holland & Fry, London

• Year
• 1923

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

• Radiomuseum.org ID
• 76224

• • Brand: OTB (O.T.B.)

• 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.

• Material
• Wooden case

• from Radiomuseum.org
• Model: OTB Type A - Harding, Holland & Fry, London

• Shape
• Miscellaneous shapes - described under notes.

• Dimensions (WHD)
• 0 x 2.25 x 0 inch / 0 x 57 x 0 mm

• Notes
• turned mahogany lidded box,5"dia.; BBC/PMG stamp, GPO No.745;

• Source of data
• Radio! Radio!

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

• Other Models

• Here you find 2 models, 2 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Harding, Holland & Fry, London