{"id":35267,"date":"2026-11-04T00:00:55","date_gmt":"2026-11-03T16:00:55","guid":{"rendered":"https:\/\/www.richcoln.com\/?p=35267"},"modified":"2026-11-04T09:56:16","modified_gmt":"2026-11-04T01:56:16","slug":"unison-research-triode25-be_hi-finews-review","status":"publish","type":"post","link":"https:\/\/www.richcoln.com\/zh\/2026\/11\/04\/unison-research-triode25-be_hi-finews-review\/","title":{"rendered":"hi-finews \u8a55\u6e2c\uff5cUnison Research Triode 25 BE \u771f\u7a7a\u7ba1\u5408\u4f75\u64f4\u97f3\u6a5f"},"content":{"rendered":"

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icon_color=”#a3a3a3″ quote_icon_color=”rgba(124,218,36,0.64)” toggle_text_color=”#666666″ body_text_color=”#666666″ border_color_all=”rgba(0,0,0,0.08)” sticky_enabled=”0″][et_pb_accordion_item open=”on” _builder_version=”4.27.5″ _module_preset=”default” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″]<\/p>\n

Hailing from Treviso in northeast Italy, Unison Research is a brand with an obvious love of tubes, to the point that you half expect to find a hot bottle or two incorporated in its Malibran and Max loudspeakers. Its CD players, the Unico CD Uno and Due, have tube-based output stages, while the solid-state amps in the same series have tube-based inputs. But the company is best known for its all-tube amplifiers, of which there are 15 spread across integrated, pre and power ranges.<\/p>\n

The Triode 25 Black Edition integrated in just the one colourway, is an upgrade of the standard Triode 25. It\u2019s also positioned above the entry-level Simply Italy and Preludio integrated models, but below a string of amplifiers ranging from the S6 to the flagship Reference Pre\/Power system.<\/p>\n

Black to the future<\/strong>
Established in 1987, Unison Research claims to be \u2018the Italian leader in the production of tube amplifiers, and among the top ten in Europe\u2019. Despite these lofty ambitions, it isn\u2019t in the habit of continually refreshing its catalogue \u2013 its Reference preamp and monoblocks, for example, have been leading the line for over 15 years. And even this Black Edition (BE) of the Triode 25 outwardly appears very similar to the original, as do BE upgrades of its Simply Italy and S6 models.<\/p>\n

Are we just looking at a new paint job? This unit does indeed remove the silver trim of the standard version and gives the wooden fascia a piano black finish. The motorised volume and manual source controls are also now black, and Unison Research has taken the opportunity to tidy up some of the amp\u2019s lettering and graphics. But, of course, this isn\u2019t all: there\u2019s an obvious change around the back, plus refinements under the hood.<\/p>\n

More power, less distortion \u2013 this is what the Triode 25 BE promises thanks to revisions to layout and power management. This includes the addition of \u2018strategically placed\u2019 polypropylene capacitors in the power supply, and a new input selection circuit. Moreover, the claimed output is now 2x50W in pentode mode or 2x30W in triode versus the 2x45W and 2x25W of the original (all re. 6ohm). Last but not least, the pairs of power tubes, operating in push-pull, are now KT77s, not EL34s.<\/p>\n

As for the rear panel change, Unison Research\u2019s BE models are \u2018digital ready\u2019 out of the box \u2013 the DAC module is otherwise offered as an upgrade path on its standard siblings. Tucked away on the righthand side of the Triode 25 BE\u2019s connections are USB-B, optical and coaxial ports, feeding into an ESS ES9018K2M chip and supporting up to 384kHz LPCM and DSD256 over USB. Digital inputs are not especially common on tube integrateds, for a host of different reasons, so they make this particular model a little more \u2018integrated\u2019 than many others.<\/p>\n

In the mode<\/strong>
Analogue connections are on unbalanced RCAs, with three line inputs and one line output complemented by an unfiltered stereo sub out that the manufacturer says \u2018maintains the sound timbre of the amplifier\u2019 into your partnering (active) subwoofer. Next to these is a single set of speaker binding posts \u2013 other Unison Research amps have multiple speaker output taps, but not this one.<\/p>\n

The Triode 25 BE has a tidy footprint, being just 30cm wide, 45cm deep and 20cm high. A black metal grille protects its complement of tubes \u2013 the four power tubes, plus two ECC83s in the input\/line stage and an ECC82 rectifier \u2013 and keeps curious fingers away from the heat and high voltages. This grille is held in place by cap screws, but you\u2019ll want to leave these removed as there are controls on the amp\u2019s top surface for switching between pentode and triode operation, and selecting between \u2018High\u2019 (12dB) and \u2018Low\u2019 (10dB) negative feedback modes. It\u2019s also here where you can check and fine-tune the output tube bias, aided by a built-in meter.<\/p>\n

If you subscribe to the notion, espoused in Jurassic Park, that anything that\u2019s heavy is also expensive, then you might initially expect the Triode 25 BE to sell for more than \u00a33900 \u2013 it\u2019s surprisingly hefty, given its agreeable size, at 20kg. It also appears well put together, and is something of a pleasure to use, particularly the robust click of each turn of its source controller. A supplied system remote control is littered with buttons, but only two \u2013 volume up and down \u2013 are relevant here.<\/p>\n

Bit of a steal<\/strong>
Considering this amplifier\u2019s price and specification, it\u2019s unlikely to be chosen to power large floorstanders in a large listening room. Yet, whether used with B&W\u2019s 705 S3 Signatures, or ELAC\u2019s more power-hungry VELA BS 403.2s, in a more typical 5mx3m space, the Triode 25 BE was not found wanting. Concerns about power are put to one side by a performance that packs a delicious punch, and while this is most notable in pentode mode, the triode operation doesn\u2019t immediately strip it of its energy and excitement.<\/p>\n

What\u2019s also important, however, is that this amp\u2019s robust delivery goes hand in hand with those sought-after tube amp qualities of warmth, richness and sense of musical ease. If you imagine a cross between Black Sabbath and Lynyrd Skynyrd, you\u2019ll get close to Louisiana-based \u2018sludge metal\u2019 band Down, whose album NOLA [EastWest 7559-61830-2] combines pounding drums and slow, deep riffs with tinges of blues and a \u2018Southern\u2019 guitar sound. Unison Research\u2019s amp coped with it brilliantly, standout track \u2018Lifer\u2019 slamming from the B&W speakers with both an aggressive attitude and lush, warm textures.<\/p>\n

It pulled off the same trick with Iron Maiden\u2019s \u2018Wasted Years\u2019 [Somewhere In Time; EMI CDP 7463412], a track that can sound a bit thin due to its glassy production. The Triode 25 BE applied its own finish, while still leaping into the drumming and basslines. By the end of Adrian Smith\u2019s famous guitar solo, I was grinning from ear to ear and beginning to consider the amp\u2019s price a bit of a steal.<\/p>\n

Rock and refine<\/strong>
This Triode 25 BE can, for want of a better word, rock, but is even more accomplished at luring you into music of a softer, more refined nature. That feeling of easy communication, of no sense of strain, was apparent from the very start of \u2018Moins De Troi\u2019, performed by French vocalist \u00c9lodie Fr\u00e9g\u00e9 and the London Session Orchestra [\u00c9lodie Fr\u00e9g\u00e9; Mercury 983 695-3]. Long string notes had a silky, smooth quality, Fr\u00e9g\u00e9\u2019s voice was delivered with breathiness and texture, and the bassline that flits in and out was plump and deep.<\/p>\n

As for the amp\u2019s \u2018sound seasoning\u2019 tools, my default setting was pentode \u2013 call me a hooligan, but I enjoyed the extra amount of bass drive and slam. Triode operation, however, is arguably a little more balanced and natural, and a better fit for some material. The layered choral harmonies of the Cappella Nova ensemble, performing James Macmillan\u2019s \u2018Strathclyde Motets\u2019 [Who Are These Angels?, Linn Records; 192kHz\/24-bit], had a hint of fizziness around the edges in pentode mode. Switching to triode, which can be done on the fly, brought welcome extra smoothness.<\/p>\n

Hot dog<\/strong>
Equally, running the Triode 25 BE in the mode it\u2019s named after (and with the more open-sounding low feedback option), made it that little bit easier to inspect the fine touch of the Budapest Festival Orchestra, playing Mahler\u2019s Symphony No. 1 under Ivan Fischer [Channel Classics 192kHz\/24-bit]. This piece, with its light\/dark dynamics and full array of instruments, at first enjoyed delicacy, space and an involving, deep soundstage, before percussion and brass crescendos revealed that there\u2019s sufficient power on tap.<\/p>\n

Replacing a Hegel Viking CD player and Primare PRE35 streamer\/DAC [HFN Dec \u201919] with a Mac\/Roon set-up, and making use of the amp\u2019s own D\/A stage, the performance stayed impressive. A cover of Led Zeppelin\u2019s \u2018Black Dog\u2019, featuring cellist Troy Everett and guitarist\/singer Carmen Vandenberg [Sunset Sound download], maintained the smooth, musical sound, and confidently portrayed the sustained string notes and weight of the piano. More \u2018upmarket\u2019 digital stages can extract greater amounts of fine detail, but this ESS-based DAC stage should please anyone.<\/p>\n

Moreover, such is the Triode 25 BE\u2019s performance, you can leave your music library playing at random, through analogue or digital inputs, and not hear anything disagreeable. Ed Rush and Optical\u2019s \u2018City 17\u2019 [Travel The Galaxy; Virus Recordings VRS007] sounded effortless in the bass, this club-friendly track pushing forward, before The Doors\u2019 \u2018Soul Kitchen\u2019 [The Doors 50th Anniversary Ed., Rhino\/Elektra; 192kHz\/24-bit], with its insouciant keyboard intro, seeped into the room, the sound as sweet as honey. And these are just two tracks from a list of many in my notes \u2013 I could listen to this amp for hours.<\/p>\n

Hi-Fi News Verdict<\/strong>
A little cracker of an integrated amplifier, this Black Edition refresh of Unison Research\u2019s Triode 25 outperforms its size and price with a captivating, moreish \u2013 and, yes, tube-like \u2013 sound. The USB DAC is a useful addition, and the choice between pentode and triode modes serves both system matching and personal taste. Add in the compact style, generous connectivity and ease of use, and you\u2019re onto a winner.<\/p>\n

Pentodes or triodes?<\/strong>
Unison Research, in common with other progressive brands like Audio Research, and PrimaLuna [HFN Mar \u201921], offers switchable pentode or ultralinear and triode modes on its integrated and power amps. The KT77 beam power pentodes fitted to the Triode 25 Black Edition are well suited to triode adaption while offering greater headroom than the more common EL34 \u2018equivalent\u2019. Flick the toggle switch and the KT77\u2019s control and suppressor grids are shorted to the cathode, effectively converting it into a triode. Triode operation typically confers lower gain and lower (50%) power output but with the prospect of improved linearity\/lower distortion. Although the latter does not always hold true [HFN May \u201925], it\u2019s this difference in the harmonic \u2018fingerprint\u2019 of triode vs. pentode modes that has the former finding favour with many audiophiles, and especially those with higher sensitivity loudspeakers.<\/p>\n

In this instance, the difference in overall gain between pentode and triode modes is +38.2dB vs. +37.8dB, and power 48W vs. 29W\/8ohm, respectively, while the S\/N ratio falls by ~3dB in triode mode. However, distortion is lower in triode mode, at least through the midrange [see grey and blue traces, Graph 2, Lab Report], for example 0.095% vs. 0.085%, respectively, at 1kHz\/10W\/8ohm. Amplifier output impedance is often lower in triode mode, but that\u2019s not the case here as the Triode 25 Black Edition offers a steady ~1ohm (20Hz-20kHz) from its 6ohm transformer tap in both modes. The frequency response, and the changes in response with loudspeaker impedance, are the same in both modes.<\/p>\n

Lab Report<\/strong>
\u2018We reduced the distortion and increased the power\u2019, says Unison Research in its broad-brush description of the Triode 25\u2019s evolution to this Black Edition And, in all respects, Unison\u2019s claims are borne out on test, with the full 29W output in triode mode improving from 5% to 1% THD and distortion reduced from 1.0% to 0.085% at 10W (all re. 1kHz\/8ohm). The A-wtd S\/N is improved by 2dB and the output impedance reduced from 1.9-2.2ohm to a very linear 1.0ohm (20Hz-20kHz), improving both bass clout and the Black Edition\u2019s resilience to different loudspeaker loads. Both old and new Triode 25s have the same +2dB sub-bass boost from 10Hz down to 1Hz but the top-end responses have changed \u2013 while the original had a very flat response out to 65kHz\/\u20131dB, the newcomer has a gentle treble roll-off, falling to \u20131.5dB\/20kHz and \u201315dB\/100kHz.<\/p>\n

I discuss the triode vs. pentode operation in our [see boxout] so the following relates to its pentode\/high feedback mode. Power output broadly meets the 50W\/6ohm spec. at 2x48W\/ 8ohm and 2x38W\/4ohm while there\u2019s enough under the hood to support 56W, 54W, 43W and 32W into 8, 4, 2 and 1ohm loads, respectively, under dynamic conditions [and 33W, 35W, 30W and 25W in triode mode; dashed traces, Graph 1]. Distortion increases gently with level, from 0.03%\/1W to 0.095%\/4-12W and then up to 0.6W\/45W (all re. 1kHz\/8ohm) although these figures increase significantly with decreasing load impedance [again, see Graph 1]. Versus frequency, distortion necessarily increases at low frequencies with transformer core saturation (0.8%\/10W\/ 20Hz) and at higher frequencies with reduced compensation (feedback) at 3.7%\/10W\/20kHz.<\/p>\n

Hi-Fi News Measured Specifications:<\/strong><\/p>\n

Power output (<1% THD, 8\/4ohm) 48W (29W) \/ 38W (29W)
Dynamic power (<2% THD, 8\/4\/2\/1ohm) 56W \/ 54W \/ 43W \/ 32W
Output imp. (20Hz\u201320kHz\/100kHz) 0.98-1.1ohm \/ 3.8ohm
Freq. resp. (20Hz\u201320kHz\/100kHz) +0.0dB to \u20131.50dB\/\u201315.0dB
Input sensitivity (for 0dBW\/45W) 35mV \/ 235mV
A-wtd S\/N ratio (re. 0dBW\/45W) 87.5dB \/ 104.0dB
Distortion (20Hz-20kHz, 10W\/8ohm) 0.053-3.7% (0.031-3.7%)
Power consumption (Idle\/Rated o\/p) 127W \/ 260W
Dimensions (WHD) \/ Weight (each) 300x200x450mm \/ 20kg<\/p>\n

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Hailing from Treviso in northeast Italy, Unison Research is a brand with an obvious love of tubes, to the point that you half expect to find a hot bottle or two incorporated in its Malibran and Max loudspeakers. 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