• Country
• United States of America (USA)

• Manufacturer / Brand
• Grebe, A.H. & Co.; Richmond Hill (NY)

• Year
• 1928

• Category
• Miscellaneous (Other, Various) - see notes

• Radiomuseum.org ID
• 43474

• • Brand: Synchrophase

• Number of Tubes
• 7

• Valves / Tubes

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

• Power type and voltage
• Alternating Current supply (AC)

• from Radiomuseum.org
• Model: PwrAmp&Spkr 2250 - Grebe, A.H. & Co.; Richmond

• Notes
• One dial (primary tuning control knob)

• External source of data
• Ernst Erb

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

• Other Models

• Here you find 188 models, 124 with images and 61 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Grebe, A.H. & Co.; Richmond Hill (NY)