Unison Research Triode 25 Integrated Stereo Amplifier - Preowned

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    RRP: £3,000.00
    Our Price: £1,590.00
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    Product Information

    • Original box and packaging
    • In excellent condition
    • User manual
    • Remote control
    • Valve cage
    • Sn.630302

    The Triode 25, like its predecessor, 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 positive half-waves, respectively, and of the negative half-waves of the audio signal. The task of properly reconstructing the audio signal is then assigned to the output transformer which, thanks to its symmetrical structure, allows for a highly linear signal. Here are some of the more important and significant benefits of a push-pull structure in this type of amplifier design:

    - Higher output power

    - Higher efficiency and therefore less heat generated, with positive effects on the durability of the output tubes as well as a significant savings in energy costs

    - No static polarization of the output transformer, resulting in better performance of this section

    To ensure high quality sound in an amplifier with a push-pull configuration, however, it is essential that all individual amplification stages, especially the two semi-output amplifiers, are carefully designed and constructed to prevent the formation of dangerous and compromising odd-order harmonic distortion. This is even truer for the output transformer.

    The new Triode amplifier 25 has experienced a long and painstaking design and testing period despite the considerable experience already gained in the construction of its predecessor, the Triode 20. 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 with a load of 6 ohms with harmonic distortion extremely contained across the entire audio band.

    More info : unisonresearch.com

    Specifications

    Output Stage: Push-pull, ultralinear, Class-AB
    Output Power: 45 watt per channel (Pentode configuration) 25 watt per channel (Triode configuration)
    Output Impedance: 6 Ohm
    Negative feedback: 5 dB or 1.8 dB
    If I were in the market for a valve amplifier then this would probably be the one I would buy. I listened very hard for any fuzziness, harshness, noise, distortion, ringing, muffling, or veiling and I found none......... It has a sweet beguiling sound that you can listen to for many hours and not once will it displease you in sound terms........ It is well specified, well built and easy to maintain too, especially the built-in bias adjustment settings. In summary then, if you hanker for a valve amplifier then this one HAS to be on your audition list for sure and I give it a high recommendation. ~ Dominic Marsh/HifiPig.com

    Full Review : hifipig.com

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