• Country
• United States of America (USA)

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

• Year
• 1922 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 43555

• • Brand: Synchrophase

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

• Number of Tubes
• 2

• Valves / Tubes
• UV201 or VT-Class-II or A_Moorhead UV201 or VT-Class-II or A_Moorhead

• Main principle
• Audio-Amplification

• 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: RORK Type 2 [Internal Rheostat Elements, thumb wheels] - Grebe, A.H. & Co.; Richmond

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

• Notes
• Grebe Type II Two-Stage Audio Amplifier Type RORK with internal rheostat elements with thumb wheel control. In 1923 the Andrae catalog R-3 recommended: 2xC301A for storage batteries or 2xC299 with adapters for dry batteries.

• Price in first year of sale
• 55.00 $ +

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

• Literature/Schematics (1)
• Andrae Catalog R-6 (1923), p.10

• 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)