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Arrow left Unison Research

Unison Research SH Headphone DAC Cherry Valve Amplifier

Unison Research

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Condition: New

Brand-new, unused, unopened and undamaged item in original retail packaging (where applicable).


Limited 2 year warranty.  More info

Special order

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The SH began with the same basic remit as the coveted Simply Italy integrated amplifier; to produce a world-class sound from a specialised device using the best technology available. The result was a fairly simple, linear circuit that produces an output voltage which is more than capable of driving a wide range of headphones, while keeping distortion low throughout the frequency range. This allows the SH to deliver a consistent, coherent sound character when in use.

The input stage uses ECC83 valves, while the output stage uses one EL84 valve (both operating in triode mode). The benefits to using this specific combination of valves are in the reduced power requirements for how the valves are usually employed, resulting in extended life, and the EL84’s ability to drive an output transformer with optimal electrical and sound qualities.

The SH comes equipped with two headphone outputs, connected in parallel for easy switching between headphones, or to accommodate multiple listeners. There is also a "Sensitivity" switch, to ensure the widest possible range of headphones can be comfortably driven by this amplifier. When set to "High Sensitivity", the output voltage from the amplifier is reduced, and at "Low Sensitivity" it is at its maximum. The added advantage of this switch is for maintaining optimal sound quality while listening to music at lower volumes.

In addition to a standard un-balanced RCA input for connecting any traditional analogue source, the SH is also equipped with a class-leading USB DAC. The asynchronous USB 2.0 technology is the same as found on the recent Triode 25 amplifier, and supports audio formats up to 384kHz PCM and DSD 128. The patented jitter-elimination circuit ensures a great sonic performance, assisted by the galvanic isolation employed between the power areas of the USB interface and the conversion IC. This additional input option brings SH up-to-date with the latest requirements of computer-based audiophiles.

The reason for choosing a headphone-based product was so Unison Research could cater for the growing world of headphone audiophiles, offering them the best valve-based amplifier to enjoy. It’s very difficult for solid-state solutions to compete with the un-rivalled influence valves can have on audio performance, making the SH a must-audition for anyone who takes their sound seriously.

Key Features:

  • Tick Compatible with large selection of headphones
  • Tick ECC83 Valve used on input stage and EL84 on output stage
  • Tick Asynchronous USB interface compliant to USB 2.0 Audio Class
  • Tick Resolution up to 32bits/384kHz
  • Tick Last generation ESS Sabre DAC with jitter eliminator circuit
  • Tick Galvanic isolation between USB interface and conversion circuit
  • Tick Low phase noise clocks which reside in the "clean" supply domain to preserve low jitter performance

While we do our best to keep this information up to date, please be aware that all specifications are subject to change by the manufacturer at any time.

Max. Output Power (THD 1%), High Sensitvity: 0.5V (150 Ohms),
0.45V (33 Ohms),
0.4V (10 Ohms)
Max. Output Power (THD 1%), Low Sensitvity: 1.4V (150 Ohms),
1.1V (33 Ohms),
0.6V (10 Ohms)
Frequency Response: -0.1dB @ 10Hz / 3-dB @ 50kHz,
(Low Sensitvity Output with 33? Load)
Input Impedance: 20 kohm // 100 pF Sensitvity 0.67 V:
High Sensitvity, (10 Ohms Load) 0.33V,
Out Low Sensitvity, (33 Ohms 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 1/4 Jack Sockets (in parallel)
Feedback: 16dB
Output Impedance: 6.9 Ohms
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

While we do our best to keep this information up to date, please be aware that all specifications are subject to change by the manufacturer at any time.

Part Exchange Available

Looking to upgrade and not sure what to do with your old gear? Trade-in with us and take the hassle out of finding a new home for your equipment.

We can take back any type of product we sell, from cables, to projectors, speakers, amplifiers, AV receivers, subwoofers and more.

Just fill in the form below and we'll get back to you.

Please note we don't purchase second hand goods for cash, we take trade-ins as part payment towards the purchase of new equipment.

PayPal Credit - Flexible Credit

Buy Now, Pay Later: Get 4 months 0% finance when you spend £99 or more. Look for the PayPal Credit button when making your purchase.

More information on PayPal Credit is available here.

Klarna Finance - Pay Monthly

Pay monthly plans for up to 48 months, available on purchases between £299 and £25,000.

0% ONIF6 6 Months
0% ONIF12 12 Months
0% ONIF24 24 Months
0% ONIF36 36 Months
0% ONIF48 48 Months

Choose your deposit amount

Deposit variable between 10% and 50%, subject to a minimum loan value of £250.


Please note: These finance quotes are for a single purchase of the product listed on this page, at the price shown. Adding additional products or quantities to your order, or using any vouchers or other discounts will result in changes to the quotes and available terms.

For further information please visit the finance page.


This item is special order and will required additional time to dispatch.

Please see our stock information page for more details on how we show stock information on this website.


When in stock:

This item is available dispatch Monday to Friday, subject to cut-off times and excluding public holidays. Next working day and weekend deliveries available.

Delivery is available to most addresses within the United Kingdom. Some services may not be available to all postcodes. More information is available at the basket and on our delivery page.

We do not dispatch orders to addresses outside of the United Kingdom.

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Unison Research SH