Unison Research Unico 90 Integrated Amplifier


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Unison Research, founded in 1987 by a group of audiophile technicians, are a prestigious Italian manufacturer of valve-based premium high fidelity audio components. Specialising in the design and construction of amplifiers, CD players, headphone amps and phono stages that boast not only impeccable, effortlessly rich sound, but also an artistic visual design.

The Unico 90 features a double triode totem pole EEC 83 valve, and a single parallel totem pole ECC81 triode per each channel in the input stage. The amplifier itself is comprised of premium quality German Mundorf componentry and an innovative, Unison Research-specific circuit to deliver a weighty, rich 160 watts for channel. 

The Unico 90 is a class A hybrid integrated amplifier and offers a zero feedback performance. 


 Output power 100+100 W  RMS su 8Ω /
160+160 W  RMS su 4Ω
Frequency response  -1dB @ 12Hz e 45kHz -3 dB 
Input impedance  21Kohm // 300pF
 Input sensitivity 860mV RMS 
Input stage  Pure A class, double triode 
totem pole ECC83  and 
parallel totem pole ECC81
This single stage due
to the particular circuitry
is able to amplify the
input signal and drive 
directly the power stage.
Output stage Class AB thermostable,
complementary Hexfet
(3 pairs for channel)
Number of stages   2, This amplifier due to
the particular circuitry is
realized by only two stages:
input stage and output stage,
and use only local feedback
Input  6 line
(3 unbalanced,
2 balanced,
1 “bypass”
 Line Outputs 1 tape, 1 sub 
(volume controlled)
 Output connectors 4 + 4  bi-wiring 
 Global Feedback factor 0dB 
 THD < 0.15% @ 1kHz, 1 W
< 0.5% @ 1kHz, 10 W 
Output resistance <0.4 ohm, resistive
on all audio frequencies
Power Consumption 550 W
(at max power on 8 ohm)
Dimensions 43.5cm x 44 cm x 18 cm h
Net weight 20kg

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Providing your item is in stock, the order is usually dispatched within 24 hours. Please remember that postage and packing is completely free for orders over £50*. Out of stock items will be dispatched as soon as they become available, out of stock items can take between 4 to 21 days for dispatch.

Deliveries usually take 1-3 working days. The majority of orders are sent via our couriers'; Interlink Express on a next-day-delivery service. Smaller, low value or light-weight items are normally posted using Royal Mail Recorded or Royal Mail Special Delivery.

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*We ship free of charge to mainland UK addresses, excluding the Scottish Highlands or 'Out-Of-Reach' Scottish locations. Please consult the post-codes below to see if your location falls within this category. If you are still unsure, please contact us on 01432 354921. We also ship to Northern Ireland, Channel Islands, Scilly Isles, Scottish Isles and Scottish Highlands, however delivery to these locations will incur a charge and can only be sent via a 2-day service.

Shipping CostsMainland UK (Next-Day)Offshore/Out-of-reach (2-day)Northern Ireland, Channel Islands, Isle of Man, Scottish Islands, Scilly IslandsRepublic of Ireland (2-day)
Under £50 Orders £7.50 £12.50 £15.00
Over £50 Orders FREE £19.99 £29.99
Surcharge Orders £50.00 £69.99 £79.99
Saturday Delivery £12.99 N/A N/A
Sunday Delivery £12.99 N/A N/A
Saturday by 12 Delivery £35 N/A N/A


Post codes exempt from the free delivery service include:

Scottish Highlands Post Codes: AB30-38, AB41-42, AB44-56, FK17-99, G83, IV1-28, IV30-39, IV52-54, IV63, KW1-14, PA21-33, PA34-40, PH15-26, PH31-41, PH49-50
Islands Post Codes: HS1-9, IV40-51, IV55-56, KA27-28, KW15-17, PA20, PA41-49, PA60-78, PH42-44, ZE1-3
Northern Ireland: All BT postcodes
Channel Islands Post Codes: JE, GY
Scilly Isles Post Codes: TR21, TR22, TR23, TR24, TR25