• Country
• United States of America (USA)

• Manufacturer / Brand
• Electrical Research Laboratories Inc. (Erla); Chicago, Illinois

• Year
• 1923

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 210769

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: Audio Frequency Transformer - Electrical Research

• Dimensions (WHD)
• 70 x 70 x 40 mm / 2.8 x 2.8 x 1.6 inch

• Notes
• Audio Transformer for Erla Reflex 1920's tube receivers; suitable for few others Audio Frequency stages too.

• Net weight (2.2 lb = 1 kg)
• 0.4 kg / 0 lb 14.1 oz (0.881 lb)

• Author
• Model page created by Emilio Focosi. See "Data change" for further contributors.

• Other Models

• Here you find 133 models, 47 with images and 61 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Electrical Research Laboratories Inc. (Erla); Chicago, Illinois