Triode 25

£2600.00
  • Push-pull integrated valve amplifier
  • 32-bit, DSD-compatible USB input for streaming from a computer
  • Switchable Triode and Pentode modes

Options
Find Your Local Retailer

How To Buy

As UK distributors for the brands we represent, our main focus is to give you all the information you need to help assist with your purchase. Once you have the information you need, we want to make the purchase process as simple as possible. So we give you up-to three options on how to buy our products.

Find Your Local Retailer

Our preferred option is for you to visit a nearby store and buy what you need locally. Our authorised stockists are some of the finest specialist hi-fi retailers in the country, and they're equipped to give you the best after-sales and set-up advice possible - all in person. To find your local retailer, either click the 'Buy In-Store' button on your product page for exactly the right recommendation, or head to our comprehensive Where To Buy tool.

Buy Now, Collect Locally

If you want the added convenience of only having to pop-in to store when you know the product you want has arrived, you can use our Click & Collect-style checkout process. With Buy Now, Collect Locally, your purchase takes place online and the product is then delivered direct to your local supporting retailer; ready for you to collect when you're ready. Click here to find out more about Buy Now, Collect Locally.

Buy Now

For smaller items, you can also have the ultimate convenience of purchasing directly through our website. The checkout process is entirely secure, so you can trust your information will be safe - and your desired product will arrive with you as quickly as possible.

Click here for full Terms & Conditions.

Valve Series

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.

The Triode 25 is available with a premium cherry wood front panel (Black Wood front panel is available to Special Order).

Key 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 front panel
PureValve

Technical Data

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: 30 x 20 x 45cm
Net Weight: 20kg
Note: We’re constantly updating our website to ensure all our listings are as accurate as possible. However, the images and text on this page can be subject to change without notice, and errors and omissions are excepted.

If you have any questions, please contact us.
Product Reviews

Many of our products are firm favourites with the global hi-fi press, and this one is no exception. Check out the coveted awards and/or reviews this great product has received. To find out more click the icons below.


Click here to see all the reviews for this product.