Unison Research Triode 25 DAC Valve Amplifier

Unison Research Triode 25 DAC Valve Amplifier

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The Triode 25 DAC is an exceptionally high quality audiophile amplfieir, designed, engineered and constructed by Italian valve experts; Unison Research. The Triode 25 draws inspiration from the company's long-standing and well regarded Triode 20 amplifier, and was released as part of the company's 25th year anniversary. It also features a USB DSD DAC within, in order to give your digitally stored music files the sound of warmth and clarity that one would expect from any product designed by Unison Research. 

The Triode 25 uses a push-pull design, that makes use of EL34 tubes within the output stage. The push-pull circuit sees the inclusion of a finale stage with two power tubes seated within, intended to amplify the audio signal. This is then followed by a symmetrical output transformer stage, designed to reconstryct the signal in to a high quality linear wave. 

Using this method of amplification allows for a number of benefits to the overall sound that the amplifier is capable of offering, as a high-output power is achievable, as well as improved efficiency and the eradication of static polarization, often found in the output transformer. 

The Triode 25 can operate in one of two modes, these are 'triode' and 'pentode'. Pentode mode is capable of outputing the maximum amount of power of over 45 watts per channel (6 ohm load), with an absolute minimum of harmonic distortion experiences accross the entirety of the audio band. 

The USB input is 32bit/384 kHz and DSD 128 compliant, meaning that this amplifier is capable of supporting and enhancing the latest standards in studio quality audio. 



 Output Stage Push-Pull, Ultralinear, Class-AB 
 Output Power (per-channel) 45W in Pentode mode
25W in Triode mode (approx.) 
Output Impedance  6Ω  
 Input Impedance  47kΩ / 50pF
Negative Feedback  Switchable, 5dB or 1.8dB 
Valves  2 x ECC83 (12AX7)
1 x ECC82 (12AU7)
4 x EL34 (6CA7) 
 Power Consumption 300W max 
 Fuses T3.15A (220 - 250V) 
Dimensions (W x D x H)   30 x 45 x 20cm
 Net Weight 20kg 

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 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

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