Unison Research S6 Integrated Amplifier

• Store Demo
• 9/10 condition
• Full manufacturer warranty
• Original box and packaging & remote
• Non-smoking environment

First, bass. We'll lead with it because it's the conversation starter every time someone listens to this amplifier for the first time. The S6 grips speakers with a control you don't expect from a pure tube integrated. When we ran it with our Aurai Z165 speakers, they played deep into the 30Hz range with speed and authority that should not be possible from a tube amplifier at this power level. This is no-joke, solid-state-like bass control in a tube amplifier chassis.

The midrange is everything the EL34 is famous for: dimensional, layered, presence. Guitars and vocals have an intimacy that draws you in. On difficult recordings from the 1980s — the kind that expose midrange hardness immediately — the S6 is relaxed and honest. Nothing artificial is happening.

The highs extend naturally and smoothly without any sense of roll-off. The S6 does not sacrifice the top end to protect the midrange.

The Construction

EL34 output tubes, point-to-point wiring throughout, zero global negative feedback. Handcrafted in Italy at the Unison Research factory.

Specifications

• Tech specs

  • Type: Stereo Integrated Valve Amplifier
  • Valves: 2 x ECC83, 6 x EL34 ( Bias adjustable for each power valves )
  • Output Stage: single-ended parallel (3x EL34 per channel), ultralinear
  • Class: pure class A
  • Output Power: 35 Watt/channel
  • Bandwidth (-1dB):  20 – 30000 Hz
  • Output Impedance: 6 Ohm
  • Input Impedance: 47 kOhm
  • Inputs: 5 line
  • Outputs: 1 tape
  • Power Consumption: 265VA max
  • Dimension : 35 cm x 21cm x 49 cm (L x H x P )
  • Net Weight: 25 kg, 55 lbs