• Country
• United States of America (USA)

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

• Year
• 1919

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

• Radiomuseum.org ID
• 43550

• • Brand: Synchrophase

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

• Number of Tubes
• 3

• Valves / Tubes
• VT-Class-I or B_Moorhead-Shaw VT-Class-II or A_Moorhead VT-Class-II or A_Moorhead

• Main principle
• Detector with Vacuum Tube (Valve), no tuner; 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: RORD Type 1 [exposed rheostat windings] - Grebe, A.H. & Co.; Richmond

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

• Dimensions (WHD)
• 10.75 x 7 x 7 inch / 273 x 178 x 178 mm

• Notes
• This is the first version of the Grebe RORD vacuum tube detector /2-Stage Audio Amplifier. This model was first advertised in July of 1919. The early Grebe RORD's and RORK's had external exposed rheostat windings. Sometime in 1921 Grebe redesigned the rheostat assembly to use a thumb wheel for adjustment and windings behind the front panel. The RORD was typically paired with such tuners/receivers as the Grebe CR-2 or CR-3.

• Net weight (2.2 lb = 1 kg)
• 15 lb (15 lb 0 oz) / 6.810 kg

• Price in first year of sale
• 65.00 $

• 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 (Andrae Catalog R-6 (1923))

• Literature/Schematics (4)
• July 1919 National Radio Supply Co. catalog page 29

• 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)