• Country
• United States of America (USA)

• Manufacturer / Brand
• Electrical Research & Mfg. Co.; Waterloo, Iowa

• Year
• 1925

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 38066

• Number of Tubes
• 3

• Valves / Tubes

• Main principle
• TRF (Tuned-Radio-Frequency but use of regeneration unknown); Reflex

• Power type and voltage
• Storage and/or dry batteries

• from Radiomuseum.org
• Model: Superiorflex PS3 - Electrical Research & Mfg. Co.

• Notes
• One dial (primary tuning control knob)

• Price in first year of sale
• 145.00 $

• External source of data
• Ernst Erb

• Source of data
• Radio Collector`s Guide 1921-1932

• Other Models

• Here you find 7 models, 4 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Electrical Research & Mfg. Co.; Waterloo, Iowa