Inspired by the highly acclaimed Performance amplifier, the Sinfonia is designed to be as close to the appearance and technical ability of the Performance while achieving a lower price-point. By making this an integrated design Unison Research have stayed true to their traditions, supporting the philosophy that integrated amplifiers can achieve a better sound by taking away the need for external cables, as cable impedances can negatively effect the timbre and dynamics of a hi-fi system's delivery.
The Sinfonia is a dual-mono design, which effectively eliminates the possibility of cross-channel electrical interference. Each amplification stage inside the Sinfonia is pure Class A and operates exclusively with valves. The amplifier is able to deliver a very capable 27-30W (max.) output power, per channel.
The Sinfonia, like the Performance, is accented by two large heat-sink "wings" mounted on the sides. These are required by the high voltage stabilized power supply circuits, which are protected by a wide stainless steel cover. The top-plate is non-magnetic stainless steel and has low thermal conductivity, so it prevents the heat generated by the four KT88 from reaching the circuits located inside. This improves the stability of the amplifier, which in turn enhances the sound quality and the overall reliability of the system.
The pre-amplification and the power stage drive are based on the double triodes ECC83 and ECC82. These valves guarantee excellent linearity and offer a nearly complete absence of odd-order harmonic distortion components. Both the stages are made up of triodes in parallel and are biased by automatic bias circuits. In this way the output impedance of the two circuits can be slightly reduced, which in turn improves the linearity of the stages.
The appearance of Sinfonia is both striking and functional. The control knobs are machined from solid, non-magnetic stainless steel and are weighted and balanced to provide a smooth, precise performance when used. The wooden parts, aside from their obvious visual beauty, effectively dampen out induced resonance in the metal chassis. Thanks to this structural damping, the valves themselves, which like all vacuum tube devices are susceptible to microphony, are much less liable to generate unwanted resonance-related effects. For the best reliability and long term musical quality, all the components used in the Sinfonia have been chosen with care from the non-inductive resistors and the filter capacitors, to the pure ceramic valve bases and the vetronite printed boards.
• Dual mono Stereo Integrated Valve Amplifier
• Single-ended Parallel Class A output stage
• 27-30W output
• Subwoofer output
• 4Ω and 8Ω loudspeaker terminals
• Simply Phono power supply upgrade built-in
4 x Line (RCA), 1 x Tape (RCA), 1 Phono MM/MC (RCA)
N / A
1 x Tape, 1 x Subwoofer
N / A
20 - 30,000Hz
Single Wire / BiWire:
4 x 6550 / KT88, 2 x ECC82, 2 x ECC83
Dimensions (W x H x D):
440 x 210 x 420mm