• Country
• United States of America (USA)

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

• Year
• 1927

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 43568

• • Brand: Synchrophase

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

• Number of Tubes
• 7

• Valves / Tubes
• CX301A CX301A CX301A CX301A CX301A or CX300A or CX112A CX301A or CX112A CX371A or CX112A

• Main principle
• TRF without regeneration; 2 AF stage(s); Neutrodyne

• Tuned circuits
• 5 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries / 5 & -4.5 & -40 or -13 & 90 & 180 Volt

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: Synchrophase 7 [battery] - Grebe, A.H. & Co.; Richmond

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

• Dimensions (WHD)
• 600 x 270 x 340 mm / 23.6 x 10.6 x 13.4 inch

• Notes

• 2nd AF: the CX371A needs -40 V for C, a CX112A only 13 V!
  4 RF stages.
  By use of a Socket Power Unit 671-B the Radio can be converted for AC mains operation.

• Price in first year of sale
• 135.00 $

• External source of data
• Ernst Erb

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

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

• Mentioned in
• Collector's Guide to Antique Radios 4. Edition

• Literature/Schematics (1)
• Radio Manufacturers of the 1920's, Vol. 2

• Literature/Schematics (3)
• Radio Retailing (Radio & Television R.) (ad June 1927 page 5.)

• 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)