• Country
• United States of America (USA)

• Manufacturer / Brand
• Audio Research, Plymouth

• Year
• 1972–1976

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 148514

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

• Number of Tubes
• 17

• Valves / Tubes
• 12AX7 12AX7 12AX7 12AX7 6FQ7 6FQ7 6FQ7 6FQ7 6FQ7 6FQ7 6FQ7 6FQ7 6550 6550 6550 6550 6550

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 220 Volt

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

• Power out
• 100 W (undistorted)

• Material
• Metal case

• from Radiomuseum.org
• Model: High Definition Audio Amplifier Dual 51 - Audio Research, Plymouth

• Shape
• Rack

• Dimensions (WHD)
• 19 x 7.5 x 12.25 inch / 483 x 191 x 311 mm

• Notes
• Tube stereo power amplifier.
  50 Watts per channel minimum RMS into a 4, 8, or 16 ohm load from 20 Hz to 15 KHz with less than 1% total harmonic distortion.
  Tube complement: (4)12AX7, (8) 6FQ7, (2 matched pairs) 6550, (1) 6550.
  Options: Gold/champagne faceplate.

• Net weight (2.2 lb = 1 kg)
• 25 kg / 55 lb 1.1 oz (55.066 lb)

• Source of data
• -- Original prospect or advert

• Mentioned in
• -- Schematic

• Author
• Model page created by Franz Scharner. See "Data change" for further contributors.

• Other Models

• Here you find 37 models, 16 with images and 5 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Audio Research, Plymouth