• Country
• United States of America (USA)

• Manufacturer / Brand
• Bristol Co., The; Waterbury (CT)

• Year
• 1923

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 34584

• Number of Tubes
• 4

• Valves / Tubes

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

• Wave bands
• Broadcast only (MW).

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

• Loudspeaker
• - This model requires external speaker(s).

• from Radiomuseum.org
• Model: Grimes Inverse Duplex - Bristol Co., The; Waterbury CT

• Notes
• One dial (primary tuning control knob). It is not clear if this set is identical or not with the "new" 1924 issue.

• External source of data
• Ernst Erb

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

• Other Models

• Here you find 13 models, 12 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Bristol Co., The; Waterbury (CT)