Unison Research Sinfonia Pure Class-A Integrated Valve Amplifier

Unison Research Sinfonia is a Dual Mono/Stereo pure Class–A integrated valve amplifier sharing design philosophy and winning look with the world-renowned Performance model. Pre-amplification and power stage drive are based on double triodes ECC83 and ECC82. This valves guarantee excellent linearity and nearly complete absence of odd order harmonic distortion components. The power stage features a pair of KT88 per channel connected in parallel and working, thanks to the particular elaboration of the output transformers, in single-ended ultra linear configuration. All the valves are rigorously selected and matched. Moreover, our long observation and in depth understanding of  valves behavior has lead to the design of an original circuit which, through the control of the KT88 bias, ensures a real time compensation of the parameters affected by drift. This solution guarantees the best sound performances even after years. Inside the Sinfonia As usual for high quality integrated amplifiers,