Audio Research REF 110 Stereo Tube Amplifier—Black, KT120’s
This listing is for an Audio Research REF110 stereo amplifier in Black in excellent condition with all factory accessories and shipping carton. This unit was purchased new and used in a non-smoking home with a Ref 5 preamp. As can be seen in the photos, there are just over 500 hours on a new tube set that was purchased directly from Audio Research. Can ship via UPS, but local pick-up in the New York City/Northern NJ area is preferred. Delivery is also possible within a reasonable distance from NYC. The original list price of this unit was $10,995.
A major reason that Audio Research Reference products have been so successful is that each offers great value and the remarkable performance each provides had simply not been available near its price. Now, the Reference 110 will redefine expectations and value in a truly state-of-the-art stereo amplifier. It is perfect for anyone who does not require the high power provided by the larger mono-block Reference amplifiers. The dimensions of the REF110's chassis are identical to those of a REF210, large but not unwieldy. The thick front panel simply has an On/Off switch and corresponding LED. The attractive internal layout has the right and left channel boards mounted horizontally, flanking the transformers mounted on a raised central channel running front-to-back. A small LCD display indicating tube hours is mounted on the front of the right channel board and is visible through the top. Two small 12V D.C. fans are mounted on the rear panel, with a small internal switch allowing their speed to be set to low, medium or high. Input is balanced XLR only, while the output has separate taps for 4-8-16 ohm speaker loads via our proprietary five-way binding-posts. The REF110 has two 12V triggers (input and output) to allow remote turn-on, and there is a 20A IEC connector for the power cord.
Power output is 129 WPC continuous, based upon a push-pull, fully balanced circuit utilizing two matched pairs of KT120 output tubes per channel. The input stage utilizes direct-coupled JFETs with a 6H30 gain stage and 6H30 cathode-follower. Biasing is performed internally and is both simple and straightforward, with insulated test points on the main boards. Output stage coupling is a combination of "Ultralinear" and Audio Research "partially cathode-coupled" topology, yielding better sound than conventional pentode or triode operation.
The REF110 is truly a Reference product, maintaining the musical presentation of its larger siblings. The REF110 is simply revelatory, displaying an irresistible combination of grain-less detail, refinement and dynamic life with bass definition, impact and control. And, as a visiting reviewer who heard a preproduction unit commented, "The Reference110 reproduces the widest soundstage I have ever heard from a stereo amplifier!" This amplifier plays big, in every positive respect.
SPECIFICATIONS Tube Complement: (4 matched pairs) KT120 (Power output); (4) 6H30 (Gain stage and cathode follower)
Power Output: 110 watts per channel, typically 129 with KT120 tubes installed Frequency Response: (-3db at 1 watt) 0.6hz to 90khz Sensitivity: 1.8V RMS BAL for rated output (24db gain into 8 ohms) Input impedance: 300k ohms balanced (XLR only) Output Taps: 4, 8, and 16 ohms Damping factor: Approximately 12 Overall negative feedback: Approximately 0.7db, 16-ohm load to open circuit Noise: Less than 0.2mv RMS -106db below rated output power
(IHF weighted, input shorted) Power Supply Energy Storage: Approximately 520 joules Dimensions: 19” W x 8.75" H x 19.5" D Handles extend 1.5” (3.8cm) forward(48.3cm x 22.2cm x 49.5cm) Weight: 67.4lbs unit only, 83 lbs. shipping. (37.8 kg) Ships in the original Audio Research Box. Paypal adds 3.3%