• Country
• Great Britain (UK)

• Manufacturer / Brand
• Radio Instruments Ltd (RI)., London

• Year
• 1923

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 204713

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: Variable Intervalve Reaction Unit Type B - Radio Instruments Ltd RI.,

• Notes
• The Radio Instruments Variable Intervalve Reaction Unit Type B

• Price in first year of sale
• 2.00 GBP

• Literature/Schematics (1)
• May 5, 1923 The Wireless World & Radio Review page xliii

• Author
• Model page created by Alan Larsen. See "Data change" for further contributors.

• Other Models

• Here you find 48 models, 42 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radio Instruments Ltd (RI)., London