Sutherland 20/20 Owner's Manual
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Sutherland 20/20 Owner's Manual

Phono preamplifier
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20/20
-a phono preamplification
instrument
by Sutherland Engineering
OWNER'S MANUAL

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Summary of Contents for Sutherland 20/20

  • Page 1 20/20 -a phono preamplification instrument by Sutherland Engineering OWNER’S MANUAL...
  • Page 2 I like design challenges. That is how all new products begin. This time the challenge was to offer an AC line powered phono preamp that would fit comfortably in with the Sutherland series of battery powered phono preamps. An extremely low noise floor and precise resolution was a must.

  • Page 3: Design Philosophy

    The exact advantage can be had in a phono-preamplifier, where noise is the worst of enemies. The 20/20 may look like a conventional stereo phono stage, but take off the cover. You will discover two identical mono phono circuit boards, sharing only the same front and back panels.
  • Page 4 It does those tasks well, reliably and at a very reasonable cost. The supplies included with the 20/20 are rated at a MTF (Mean Time between Failure) of over 100,000 hours. They are used at less than 10% of their rated capacity, so reliably should be even further increased. If one were to fail, replacement is simple and inexpensive.
  • Page 5 DESIGN PHILOSOPHY DC CONNECTOR LOCATION Don’t be looking for power connections on the back panel. Instead, you will fi nd them located at the front and under the cover. That is one of those form follows function decisions. The front of the circuit board IS where the power enters the circuit, there fore that is where the connector went.

  • Page 6: Initial Set Up

    find jumpers which are clearly labeled for changing cartridge loading and gain settings. The 20/20 is shipped with a cartridge loading of 100 Ohms and a gain of 60 dB. If you wish to change those values, simply move the jumper to the correct location for each channel. Make sure that you match the loading and gain setting for each channel.
  • Page 7 20/20 specifications Gain settings Size 40 dB 17” wide 46 dB 2 ¼ “ high 52 dB 12” deep 58 dB 64 dB -external power supply (each) 5” deep Cartridge Loading 1 ½” high 100 ohms 2” wide 200 ohms...

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