Unison Research Stereo Tube Amplifier - S6
The latest version of the Unison Research S6 integrated amplifier is the result of over 25 years of experience with building valve amplifiers that have been praised all over the world for their beauty, reliability and performance. Our main goal with the S6 was to create an EL-34 integrated amplifier that has compact dimensions yet is able to drive most speakers comfortably—even those designs with relatively low efficiency.
The S6 uses three EL-34 tubes in the output stage per channel, connected together in a triple-parallel configuration that operates in single-ended Class A ultralinear mode. With this design, the S6 is able to supply an ample 35 watts per channel. Both 4-ohm and 8-ohm speaker outputs are available so that you can match the loudspeaker of your choice to the S6 for the best results.
The S6 was also designed with simplicity in mind. Our designs ensure that a minimum amount of components are found in the signal path, because we believe that the finest sound quality is the result of an unimpeded signal flow. This simplicity also translates to an amplifier that is more reliable and trouble-free in its operation.
Our dedication to robust and reliable products extends to the design of our transformers. Unison Research is one of the few audio companies in existence that designs and builds its own output transformers—each and every one is built by hand in our own workshops. We carefully match the size of each transformer to match the circuit—nothing is taken “off the rack.” This approach ensures the S6 will have a very wide frequency response, tube life will be extended and that this amp will last and produce beautiful music for decades.
The extraordinary beauty of the S6’s exterior is practical as well. Unison Research is known for its gorgeous wood accents, and the chassis of the S6 is no exception. These wood accents, however, assist in reducing vibrations that can affect the signal path. The control knobs are machined with precision from stainless steel to extremely tight tolerances—we do this for both accuracy and for the wonderful tactile qualities of these surfaces. Finally, we have designed stainless steel baseplates for the tube sockets that act as thermionic reflectors and excel at dissipating heat from the amplifier. This feature is not only visually stunning; it also extends the life of your S6 amplifier.
We spent countless hours perfecting the S6, and the result is an amplifier that epitomizes the Unison Research sound—warm, airy and transparent. From its Italian craftsmanship to its ingenious circuit design, we think you’ll agree that the S6 is one of our greatest achievements.
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