Product Announcement
Henley Audio
Unit B, Park 34, Didcot, OX11 7WB
T: +44 (0)1235 511 166
Product Announcement
Unison Research Announce Unico 90 Amplifier
Ultra-linear integrated amplifier from the Italian valve masters.
Didcot, Oxfordshire – 21st August, 2017
In 2015, Italian valve specialists Unison Research renovated their Unico range of hybrid hi-fi
electronics with the introduction of a new flagship. The Unico 150 integrated amplifier was born out
of an extensive R&D process and utilised optimal electrical characteristics to achieve a true high-end
sound performance. Now, the lessons learned in the development of the Unico 150 have resulted in
the introduction of an alternative high-end offering.
The Unico 90 amplifier is a near-perfect amplifier,
employing as few active amplification stages as
possible to produce a clean musical signal that is
true to the original source material. Where the
more powerful flagship, Unico 150, has three
active stages, the Unico 90 boasts lower power
specifications but only uses a two-stage circuit
with zero global feedback.
The Unico 90 is an integrated amplifier designed to accommodate a variety of sources via its three
RCA and two XLR pair inputs. It’s also designed to work in almost any application, with its fixed and
variable RCA outputs as well as the bi-wirable speaker terminals. The large casework is built to the
same exacting standards as previous Unico designs, but the Unico 90 borrows the same three-plate
front fascia introduced with the Unico 150, which adds an aesthetic enhancement over its
predecessors. Operation is simple and effortless via the large front-panel controls or the supplied
RC2 system remote; but the minimalist exterior belies the high-end technology hidden within.
The whole pre-amplifier section of the Unico 90 is entirely passive. The ultra-smooth, ultra-silent
ALPS volume dial is armoured at four points, allowing for even better channel separation when
listening at high volumes. The input switching control decouples inactive source inputs, reducing
cross-talk for optimal technical performance, and also employs miniature mechanical relays made to
very fine tolerances for zero signal loss.
The sonic ability of the Unico 90 comes from its gain stage, which is controlled by the amplifier’s
valve section. The valve complement is made up of ECC83 tubes in double-triode totem pole
configuration and ECC81 in parallel totem pole. The result of the circuitry effectively delivers six
triodes per-channel with perfectly measured gain, near-flat distortion and minimal output
impedance; while also providing sufficient power for the gain stage to be coupled directly to the
output power stage. Inside the output stage, three pairs of HEXFETs are used per-channel.
The Unico 90 is a dual-mono amplifier, and three pairs of thermo-stable Class AB HEXFETs are used
per-channel to provide a powerful-yet-controlled 160W (4Ω) audio signal. Thanks to this design, the
Unico 90 is able to work with a wide variety of modern loudspeakers, including many more
demanding designs.
The complex circuitry and accurate scientific principles employed throughout the Unico 90 are
complimented by the purpose-designed transformer that needs no further thermal compensation,
reducing the need for another active stage that so many amplifiers require. Similarly, all the
capacitors found throughout the electronic circuit are specially selected for their excellent
performance at very high frequencies and innate ability to exhibit very low levels of loss.
Henley Audio
Unit B, Park 34, Didcot, OX11 7WB
T: +44 (0)1235 511 166
The Unico 90 has been created out of a highly technical Research & Development process by Unison
Research, with thousands of tests and numerous prototypes being auditioned before the finished
article arrived. However, by continually putting the audio performance first, the superlative technical
standards employed inside make the Unico 90 a true high-end offering with unrivalled cosmetic,
scientific and musical appeal.
The Unico 90 is available in the UK now.
It will be available in a Silver finish, or in Black for a £100.00 surcharge.
SRP £3,500.00
Technical Information
Output Power:
Frequency Response:
Input Impedance:
Input Sensitivity:
Input Stage:
Output Stage:
Line Inputs:
Line Outputs:
Output Connectors:
Speaker Selection:
Global Feedback Factor:
Output Resistance:
Power Consumption:
Net Weight:
100 + 100W RMS (8Ω)
160 + 160W RMS (4Ω)
12Hz (-1dB) – 45kHz (-3dB)
21kΩ / 300pF
860mV RMS
Pure Class A ECC83 Double-Triode (totem pole) and
Pure Class A ECC81 (parallel totem pole)
Class AB thermo-stable, complementary HEXFET (3 pairs per channel)
3 x RCA pair (unbalanced)
2 x XLR pair (balanced)
1 x Bypass RCA pair (unbalanced)
1 x Tape (fixed)
1 x Sub (volume controlled)
4 + 4 (bi-wiring)
Recommended not to connect a load with minimum impedance < 2Ω*
< 0.15% @ (1kHz, 1W)
< 0.50% @ (1kHz, 10W)
< 0.4Ω (resistive on all audio frequencies)
550W (at max. power, 8Ω)
43.5cm x 18cm x 44cm
* The Unico 90 design has been based on a balance of features, and altering it would involve
sacrifices in certain directions. Increasing the number of MOSFETs would permit the use of
loudspeakers with impedances of < 2Ω, but this would compromise the consistency and linearity
across the high frequencies.
Henley Audio
Unit B, Park 34, Didcot, OX11 7WB
T: +44 (0)1235 511 166
Notes for Editors
Consumer Contact for Publication
Henley Audio
Didcot, Oxfordshire
01235 511 166
About Unison Research
Unison Research was founded in 1987 by a small group of audiophile enthusiasts, and since that
point the company has garnered a reputation as one of the world’s leading valve-focused hi-fi
companies. Based in Treviso, Italy, they have a strong focus on audiophile electronics with a
particular tendency toward integrated amplifier designs.
The current Unison Research range is represented by the Valve and Unico series, with other
accessories including phono stages and headphone amplifiers also available. There’s something
available for any system, and all products maintain the company’s historical reputation of paying
due diligence to both sound performance and aesthetic appeal. All internal components and almost
all the external parts are locally sourced, while all R&D and assembly is still conducted in house;
ensuring each item purchased has been hand-assembled and tested by an expert engineer with an
intimate knowledge of good sound.
About Henley Audio
Everyone has a different interpretation of what good sound is, and at Henley Audio we’re no
different. We strive to bring customers the best possible selection of hi-fi equipment from a variety
of international manufacturers.
Formed in 1997 as the result of a management buy-out of Ortofon UK, Henley Designs Ltd. (trading
as Henley Audio) is one of the UK’s premier distributors of quality hi-fi equipment. The brands we
distribute are not only highly-regarded in their own right, but they also share a symbiotic
relationship with other brands in our portfolio.
For more information, visit
Press Contact
Simon Powell
Henley Audio, Unit B, Park 34, Collett, Didcot, Oxfordshire, OX11 7WB
Tel: 01235 511 166
Fax: 01235 511 266
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