Unison Research SH Headphone Amplifier

Unison Research SH - Both Colours Unison Research SH - Black Unison Research SH - Cherry Unison Research SH - Rear Unison Research SH - With Headphones 1 Unison Research SH - With Headphones 2

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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 SH Headphone Amplifier is based heavily around the principles and design ethos as that of the Simply Italy integrated amplifier. The SH utilises linear circuitry that produces a weighty and robust level of output, capable of driving a vast range of premium headphone models to their full potential, all the while keeping distortion to an absolute minimum throughout the entire frequency spectrum. 

The input stage features ECC83 valves, while the output stage comprises of one EL84 valve, these work in triode mode. This specific combination of valves results in a reduced power requirement for how the valves are usually employed, which in turn results in a much longer lifespan for the valves.  The EL84’s ability to drive an output transformer with optimal electrical and sound qualities.


 Max. Output Power (THD 1%), High Sensitvity 0.5V (150Ω), 0.45V (33Ω), 0.4V (10Ω) 
Max. Output Power (THD 1%), Low Sensitvity 1.4V (150Ω), 1.1V (33Ω), 0.6V (10Ω) 
Frequency Response -0.1dB @ 10Hz / 3-dB @ 50kHz 
(Low Sensitvity Output with 33Ω Load) 
Input Impedance 20 kohm // 100 pF Sensitvity 0.67 V: 
High Sensitvity, (10Ω Load) 0.33V Out
Low Sensitvity, (33Ω Load) 1V Out 
Input Stage Pure Class A, ECC83/12AX7 
Output Stage Class A, EL84 (Triode Mode) 
Inputs  1 x RCA Line Level
1 x USB (Type-B) 
Output  2 x ¼” Jack Sockets (in parallel) 
Feedback  16dB 
 Output Impedance 6.9Ω 
 Total Harmonic Distortion  < 0.2% @ 1kHz 0.5V
< 0.8% to 1 V
Power Consumption 45W
Dimensions (W x D x H) 22.5 x 12.6 x 32.2cm
Weight 6kg

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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.

Once your product has been dispatched, you will be notified via email and sent a unique consignment number, you can use this number at http://www.interlinkexpress.com to check the status of your delivery. If you have provided a mobile telephone number, Interlink's Predict service will notify you by text (and email) of a one-hour delivery window. If the window they suggest is inconvenient, you can change the date of delivery to a later one via text or email.

*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