• Country
• United States of America (USA)

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

• Year
• 1919/1920

• Category
• Radio module pre 1926 (not a part, not a key)

• Radiomuseum.org ID
• 43514

• • Brand: Synchrophase

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

• Main principle
• Tuner pre 1926 (not a wave trap)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Wooden case

• from Radiomuseum.org
• Model: CR4 - Grebe, A.H. & Co.; Richmond

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

• Dimensions (WHD)
• 11.25 x 11.25 x 0 inch / 286 x 286 x 0 mm

• Notes

• Grebe Short-Wave Regenerative Receiver Type CR-4
  Range, 170 to 680 meters. 
  Three dials (primary tuning control knobs)

   

  The normal range of the secondary circuit includes wave-lengths from 170 to 375 meters. In order to increase the wave-length range a special fixed condenser is provided. When this condenser is connected across terminals A and B on the set, the minimum wave-length becomes 280 and the maximum 680. 

• Net weight (2.2 lb = 1 kg)
• 12.5 lb (12 lb 8 oz) / 5.675 kg

• Price in first year of sale
• 65.00 $

• 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
• The Radio Collector's Directory and Price Guide 1921 - 1965

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

• Literature/Schematics (3)
• February, 1920 A. H. Grebe & Co. Bulletin R-103

• Literature/Schematics (4)
• December 1919 QST magazine page 65

• 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)