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Unison Research Unico 90 Hybrid Integrated Amplifier
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The Unico 90 is a near-perfect integrated amplifier, employing as few active 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.

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.

Key Features:

  • Audiophile-grade integrated amplifier
  • Output power 160 + 160W at 4Ω
  • ECC83 (12AX7) valves used at input stage
  • Additional balanced inputs (XLR)
  • Subwoofer output
  • Bi-wirable speaker outputs
  • Premium black finish available
  • RC2 remote included
Unison Research Unico 90, Hi-Fi News, August 2017

Hi-Fi News, August 2017

Reviewed By: Ken Kessler
Labs By: Paul Miller
Rating: Highly Commended
Sound Quality: 83%

Comments of Note:
"Tired of the acronyms and forced nomenclature of online music sources? Ready to get back to the country? The Unico 90 – even if you’re too young to know life before iTunes – returns us to the era of ‘honest hi-fi’, when listening involved source selection, volume setting and nothing else. It will regale you with silky sound, more grunt than most people need and a sense of freedom. You are allowed to simply wallow in it."

Output Power:  100 + 100W RMS (8Ω)
160 + 160W RMS (4Ω) 
Frequency Response:  12Hz (-1dB) – 45kHz (-3dB)
Input Impedance:  21kΩ / 300pF 
Input Sensitivity:  860mV RMS 
Input Stage:

Pure Class A, ECC83 Triode (Totem Pole) and
ECC81 (Parallel Totem Pole)
Output Stage:  Class AB Thermo-Stable, 
Complementary HEXFET (3 Pairs per channel) 
Line Inputs:  3x RCA pair (Unbalanced)
2x XLR pair (Balanced)
1x Bypass RCA pair (Unbalanced) 
Line Outputs:  1x Tape (Fixed)
1x Sub (Variable)
Output Connectors:  4+4 (Bi-Wiring) 
Global Feedback Factor: 0dB 
Total Harmonic Distortion: < 0.15% at (1kHz, 1W)
< 0.5% at (1kHz, 10W)
Output Resistance:  < 0.4Ω 
Power Consumption: 550W (at Max. Power, 8Ω)
Dimensions: 43.5 x 18 x 44cm
Weight: 20kg

We are still delivering orders as normal. When your order ships you will still receive tracking details. For UK shipments, Our couriers have procedures in place to ensure deliveries are arriving as quickly & safely as possible. Drivers can now sign for your parcels, however will notify you that they have arrived, in order to ensure you receive your parcel. Signing for the parcel has now been stopped temporally for hygiene reasons. Drivers are also working with customer instructions, so you can ask them to leave the parcel in a safe place (doorstep etc...) if you prefer not to come into direct contact with the driver.

There has been no changes to deliveries with Brexit. All deliveries to the UK mainland, Northern Ireland and the Republic of Ireland are operating as normal. No VAT or charges are applicable. 

We have several deomonstation areas in both of our branches. Please give us a call on 03435236169 or email support@kronosav.com to enquire about hearing products at your local branch. 

Please always contact us before to make sure the product(s) are available

Express Deliveries

Express Delivery is FREE on all orders over £50. Express Delivery offers delivery in 24-72 hours from time of purchase. We use premium couriers for this service, mainly DPD & Royal Mail. DPD will offer you a one hour window for delivery to make sure someone is at home, or you can reschedule the delivery if no one is around. 

Standard Deliveries

Here at Kronos AV, we have vast experience with e-commerce sales. Making sure that your parcel arrives undamaged is a huge priority for us. That’s why at Kronos AV, we only use premium couriers for all our orders. All our parcels are shipped with DPD or Royal Mail and are always sent Signed For to make sure it gets to the right person. 

If for any reason your parcel does arrived damaged, please get in touch, and we will be happy to get everything resolved for you. We are always on hand to help!


Delivery is FREE on all orders over £50. In order to offer FREE delivery to UK customers, we use several premium couriers to ensure your delivery arrives safe.

Most large orders (over 2kg) ship using DPD or DHL courier and smaller orders (under 2kg) by Royal Mail signed for services.

The most appropriate courier will be chosen for the items ordered to ensure the quickest possible delivery.

We can offer very generous trade in offers across the majority of our product range. 

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If you have any question, please feel free to call us on 03435236169 or email support@kronosav.com