Unison Research Triode 25

amazon Unison Research Triode 25 reviews

Design

An amplifier is 300mm horizontal, 450mm deep, and 200mm high, weighing 23kg. The front is made of peach wood, lacquered black or golden luster. Body made of hardened steel and covered with insulation. The show is the layout of four very popular EL-34 light bulbs. Behind the four bulbs are two stainless steel sheets that both provide heat dissipation from the bulb, preventing the heat from sweeping down the circuit below the amplifier, thereby affecting the sound quality. Enhance the look of the amplifier.
The Triode 25 is the replacement for the previous Triode 20 model. Like the predecessor, the push-pull circuit with four EL34 balls is the main point of the amplifier. The EL 34 is probably one of the most commonly used power lamps in light bulb amplifiers due to its versatile acoustic characteristics, with its compact bass strips, clear midrange, and warm strips of warmth. Expensive or cheap, depending on the origin of the ball and the components under the circuit. The preamplifier amplifier consists of two ECC83 balls and one ECC82 ball that reverses the phase and energizes the input.

Unison Research engineers researched the power circuitry of the Triode 25 into two modes of operation: Pentode and Triode. To switch between these two modes, they use a switch designed above the machine for the easy process when you want to change. Those who play the lamp amplifier and learn about the circuit design will probably know, Pentode is a 5-pole active light mode (including a cathode, positive pole, grid, and radical). Triode is a three-pole mode (negative, polar, and positive polarity). Some of the advantages and disadvantages between these two modes are also often seen on audio forums. But in general, when playing in Pentode mode, the power will increase. Specifically, in this Triode 25 amplifier, with Triode mode operation, the power achieved is 25W; when playing Pentode, capacity is reached 45W.

Users always have the optimum choice between the two modes. Experts recommend that you choose Triode when you want to hear light music at low volumes. For strong music genres, use Pentode mode. Technically coupled, high-sensitivity speakers above 90dB may be suitable for Triode, and less than 90dB should use Pentode mode.
The amplifier also has a manual bias circuit design. With a clock, the top side of the amplifier has a single button to select channels to adjust and two buttons knob up and down. The simplest thing to do is to change when the clock is in the middle.

A low-feedback switch is also located on the machine. It will allow the user to choose between two low-level levels already set up. It is the fine-tuning of the amplifier’s performance. With a very low feedback rate, even at the minimum position, the total feedback is never greater than 12 dB; it is not tiring to listen to music for hours for a good result.

The output transformer is designed and manufactured with the most stringent specifications to ensure a broadband bandwidth of up to 30kHz when rated with maximum power. Toroidal source transformer, enclosed and very good word. The power supply runs through a rectangular bridge up to 8 times to reach a 500-volt output, powered by the anode of the bulb. To keep the feedback low, the noise cancellation and a clean source of power were the engineers’ attention. The filter capacitors in this amplifier are also selected to deserve an amplifier marking 25 years of establishment.

The input design includes 4 RCA jacks, gold-plated for the best connection to the jack. ALPS volume suppressors belong to the category RG27 series used in hi-end products. The remote is made of wood with the traditional design of Unison Research, which can be used for other amplifiers of the same brand.

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Triode 25 Integrated Amplifier: Buy it now

Sound

To mix with the Triode 25 amplifier, we use the Tannoy Turnberry GR speaker. This speaker has a sensitivity of 93dB, 8-ohm impedance, rated power from 20W up. So technically, we can mix Triode 25 and play in triode mode.

The sound of the duo is really good. The high middle strip is reproduced. Although playing in Triode mode with an output power of 25W, the beat is strong enough for Turnberry GR bass speakers to produce the correct bass and force. With Best Audiophile Voices III album, track 10, “When you say nothing at all,” performed by Alison Krauss, will hear the smooth, smooth guitar sound. Especially the many pieces of the same musical instruments are not tangled and noisy; a contrast is very clear, detailed. Track 2 is also on this CD, a jazz rhythm with slow rhythms, rattling sound, clear and rich emotion. The vocalist is prominent in the accompaniment of music, showing a great musical accompaniment due to the rational arrangement of amplifiers and speakers.

To test the amplifier through Pentode, we chose Sonus Faber’s Cremona Auditor M. This is a bookshelf type with a 4 Ohm impedance, a sensitivity of 88dB. In general, it is quite hard to beat. A fast-paced and bass track on “Stockfisch Records” to test low-frequency reproduction. The bass is not deep. The drumbeats, the bass tones show the power of a single AML-34 per channel. When listening to the singer perform, the mid-range is clear, but the treble is brighter. Especially the repertoire Saxo no longer honest in the ads. Perhaps this is the downside of the EL-34 bulb on the machine when exploited at large capacity rather than Pentode mode.

Overall, the Triode 25 is a fairly standard amplifier in everything from shape to quality. It owns a high-quality component design, quality, and seriousness in circuit design, making this product a small yet well-tuned amplifier. If you choose the right speaker, even in the Triode mode, even a small power amplifier, the Triode 25 will give long listener satisfaction.