• Country
• United States of America (USA)

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

• Year
• 1920

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 43554

• • Brand: Synchrophase

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 2

• Valves / Tubes
• VT-Class-II or A_Moorhead VT-Class-II or A_Moorhead

• Main principle
• Audio-Amplification; 2 AF stage(s)

• Wave bands
• - without

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

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

• Material
• Wooden case

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

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Price in first year of sale
• 45.00 $

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Mentioned in
• Radio Manufacturers of the 1920's, Vol. 2

• 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)