• Country
• United States of America (USA)

• Manufacturer / Brand
• Audio Research, Plymouth

• Year
• 1987–1996

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 196267

• Number of Tubes
• 2

• Valves / Tubes
• 6922 6922

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 100-135 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Preamplifier SP9 - Audio Research, Plymouth

• Shape
• Book-shelf unit.

• Dimensions (WHD)
• 19 x 5.25 x 10.25 inch / 483 x 133 x 260 mm

• Net weight (2.2 lb = 1 kg)
• 12 lb (12 lb 0 oz) / 5.448 kg

• Price in first year of sale
• 1,695.00 $

• Author
• Model page created by Gottfried Silberhorn. See "Data change" for further contributors.

• Other Models

• Here you find 37 models, 14 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Audio Research, Plymouth