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Unison Research Triode 25 DAC Integrated Valve Amplifier

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From £2,600.00 (FREE UK Delivery)
Item out of Stock  |  Usually dispatched within 24 hours
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The Triode 25 was born out of the huge success of the long-standing Triode 20 amplifier, and released as part of the 25th anniversary celebrations of Unison Research's formation. It's been developed over an extended period to ensure it is a worthy successor to the Triode 20's name.

Like its predecessor, the Triode 25 is a push-pull amplifier that utilizes EL34 tubes in the output stage. The push-pull circuit includes a final stage with two power tubes intended for the amplification of the audio signal, and is then followed by a symmetrical output transformer stage that reconstructs the signal into a high-quality linear wave.

Using a push-pull structure in this amplifier design allows for numerous benefits, including higher-output power compared to single-ended designs, improved efficiency and no static polarization of the output transformer for greater performance in the output section. However, for this to work well it is essential that all the individual amplification stages are carefully designed and constructed to prevent the formation of dangerous and compromising odd-order harmonic distortion. This is true for the two semi-output amplifiers, and even more important in the output transformer.

The Triode 25 can operate in two modes: triode and pentode. The latter is capable of delivering a maximum power output of over 45 watts per channel (6Ω load) with minimal harmonic distortion across the entire audio band.

With the use of an Apple lightning to USB connector (not included) you can plug your iPhone/iPod/iPad directly into the Triode 25's DAC and play your hi-res music files straight from your device.

The addition of a USB input modernises the Triode 25 and increases its appeal to the growing world of computer audiophiles, who use their laptop or computer as a high-quality audio source for their hi-fi. The USB input is 32-bit/384kHz and DSD 128 compliant to support the latest standards in studio quality audio.

Features:

  • Push-pull integrated valve amplifier
  • 32-bit, DSD-compatible USB input for streaming from a computer
  • Switchable Triode and Pentode modes
  • Premium design throughout
  • Locally sourced materials
  • Based on the long-standing Triode 20 design
  • EL34 tubes in the output stage
  • RC2 remote with black wood finish included
  • Connect iPad/iPod/iPhone directly via Lightning to USB cable (not included)
  • Premium Cherry Wood or Black front panel

Technical Specification:

  • 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

We endeavour to despatch same day (for orders placed up to 2pm) on available stock items to the vast majority of UK mainland addresses. Please remember to check with us first for a physical stock check if next day delivery is important to you.

UK ORDERS:  We despatch the bulk of our UK mainland items on a 24 hour service – Free of Charge.  Free delivery also applies to the Isle of Man, Isle of Wight, the Scilly Isles, the Scottish highlands and Islands, the Channel Islands and Northern Ireland but may take a day or so longer. Smaller items are delivered using Royal Mail recorded delivery or special delivery. Larger items are delivered using a courier service such as Interlink Express, DPD, UPS or DHL. 

INTERNATIONAL ORDERS: We offer competitive rates which can be confirmed by email. Please just ask – we will need a full delivery address and telephone number. Smaller items are delivered using Royal Mail Small Packets Airmail with International Tracked and/or Signed depending on value of item and availability of the service. Larger International shipments are sent by insured and tracked services using DPD, DHL or UPS. If there are any delays due to specific customs regulations, etc, you will be contacted by Hifisound or by the courier with a request for any further information required. Customs duties do not apply for shipments into any EU country (for a full list please refer to the EU Country List). Customs duties can apply for countries outside of the EU. Customers in these countries are responsible for all taxes and duties incurred when the items enter their country.

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