• Country
• Great Britain (UK)

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

• Year
• 1924/1925

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 309409

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: R.I. Transformers LF Low Frequency - Radio Instruments Ltd RI.,

• Dimensions (WHD)
• 79 x 92 x 69 mm / 3.1 x 3.6 x 2.7 inch

• Notes

• Ratio 4 to1; 10 to 1 and 25 to 1

  tested at 2500 volts

• Net weight (2.2 lb = 1 kg)
• 0.655 kg / 1 lb 7.1 oz (1.443 lb)

• Mentioned in
• Cat. Brown Brothers No 217 1925/1926 p. 82

• Author
• Model page created by Manfred Rathgeb. 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