Unico Nuovo

The Best Value in the Unico Line

We'll just say it: the Unico Nuovo is the Unico we'd recommend first to most people. Not because the 90 or 150 aren't better amplifiers — they are — but because the Nuovo does something that's genuinely hard to find at its price. It sounds full bodied and rich, with a fantastic midrange, extended highs, and very powerful bass. It produces a relaxed, enveloping listening experience that doesn't feel like a compromise.

We've compared it directly in our own system against the ModWright LS99 and KWA99 separates. The ModWright combination is more refined and more transparent in the higher frequencies — it should be, at the price difference. But the Nuovo fairs very well, producing a music listening experience that is genuinely competitive well above its price class. With the right tube and fuse upgrades, which we'll get to below, this becomes the cornerstone of a system that would surprise you.

Unison Research's stated goal for the Nuovo was to give music vitality — vigor, liveliness, and power. They succeeded. The Absolute Sound reviewed it and agreed. So do we.

The Ionic Bias Circuit — What Makes the Nuovo Different

The Unico Primo uses a single ECC83 triode per channel. The Nuovo uses two — wired in parallel, with a new biasing solution borrowed from high-end phono stage design. Unison Research calls it ionic bias.

The ionic bias system works in tandem with level shifter and signal follower stages downstream of the triode to deliver the tube stage's output to the MOSFET output stage with minimal phase displacement. The bias automatically adjusts as the tubes age and settle — no manual rebiasing required, ever. This is not a marketing claim. It is a practical engineering decision that means the Nuovo maintains consistent sonic character across the life of its tubes without requiring any owner intervention.

Doubling the number of triodes and operating them in parallel reduces noise and output impedance from the tube stage, allowing it to drive the MOSFET output stage more directly and more quietly than the Primo's single-triode arrangement. The result is improved channel separation, lower noise, and a tube stage that is more in control of the signal it's handing to the output stage.

The Output Stage and the Rest of the Circuit

Eight power MOSFETs — four per channel, symmetrically laid out — handle the output stage, fed by a dedicated power supply stage configured to maintain adequate voltage regardless of signal demand. The symmetrical MOSFET layout and the ionic bias system working together produce what Unison Research describes as minimal phase displacement throughout — a characteristic that shows up in the sound as timing accuracy and dynamic coherence.

The input selector is switched at the rear of the amplifier, near the inputs themselves, keeping the signal path from input socket to tube stage as short as physically possible. The power transformer is positioned well away from the audio circuits. The heatsinks wrap around the transformer, simultaneously drawing heat away from the output stage and acting as a shield between the transformer's magnetic field and the amplifier circuits. These are layout decisions that require design discipline and add no cost savings — they exist because they matter.

The 15mm aluminum faceplate is machined, sandblasted, and anodized — the same process and finish quality that runs throughout the Unico line. The volume control rod runs from the front panel to a potentiometer at the rear of the amplifier, near the inputs, so that front-panel volume adjustment happens at the source rather than requiring the signal to travel the full length of the chassis and back.

The Optional Phono Stage

The phono board supports both MM and MC cartridges with selectable gain and loading. MM input impedance is 47kΩ with 220pF capacitance; MC input is 100Ω with 440pF. Gain is selectable at MM 40dB or MC 50dB, with a further +10dB option. RIAA equalization uses an active circuit at low frequencies and passive at high frequencies — a hybrid approach that balances noise performance at the bottom end with accuracy at the top. THD is 0.09% at 5mV/1kHz MM, which is competitive at this price level.

At TweekGeek, the Nuovo ships with the phono stage factory installed — ready for vinyl out of the box.

Getting the Most Out of the Nuovo — Our Recommendations

The Nuovo responds meaningfully to both tube rolling and fuse upgrades. We've done the legwork. Here's what we found.

The stock tubes are a reasonable starting point, but the Gold Lion ECC83/12AX7 is a genuine improvement — lower noise floor, better midrange and high frequency transparency, and a sound that simply locks in more convincingly. That's the first step for anyone who wants to push the Nuovo further.

The Ray Tubes Select 12AX7 goes further still. Compared to the Gold Lions, the Ray Tubes open up the soundstage, improve vocal clarity, and bring noticeably better high frequency transparency. In our assessment, they beat the Gold Lions by a margin that justifies the price difference. If you want the best out of the Nuovo's tube stage, this is where we'd point you.

On the fuse side, the QSA Violet improved low-level resolution and brought a sense of naturalness and flow to the presentation — the qualities that make the difference between an amplifier that sounds technically proficient and one that draws you in. The QSA Red took things further: dramatically improved dimensionality, soundstage opening in all directions, and a level of resolution and transparency that made the Violet seem flat by comparison. The Red fuse is expensive. But the combination of Nuovo plus Ray Tubes plus QSA Red delivers performance that we'd place in the $6,000–$7,500 range. For considerably less than that. It's a real thing.

The Nuovo uses a 5×20mm 6.3A slow-blow fuse if you want to explore this path.

Press Recognition

The Absolute Sound reviewed the Unico Nuovo as part of their Best Integrated Amplifiers Under $5k series, finding that Unison Research's goal of giving music vitality — vigor, liveliness, and power — was met convincingly.
Read the review

TechRadar described the Nuovo as offering an authentic taste of the high end — natural flow, fast and assured delivery, genuine soundstage depth and width, and a tube-influenced character that arises organically from within the music rather than being imposed on it. Their conclusion: solid-state power delivery leavened by the grace and polish of a good valve design.
Read the review

Specifications

• Type — Hybrid integrated amplifier
• Output power — 95W @ 8Ω
• Input stage — Pure Class A; 2× ECC83/12AX7 in parallel double-triode configuration; ionic bias
• Output stage — 8× power MOSFET, symmetrical layout
• Feedback — 10dB local
• THD — 0.15% @ 10W/1kHz
• Frequency response — -0.1dB @ 10Hz; -0.5dB @ 100kHz
• Input impedance — 50kΩ / 47pF
• Input sensitivity — 260mV RMS
• Inputs — 5× RCA line (1× configurable as phono)
• Outputs — 4 + 4 binding posts (bi-wiring); 1× subwoofer RCA (volume controlled); 1× tape RCA
• Phono stage (factory installed) — MM: 47kΩ / 220pF / 40dB gain; MC: 100Ω / 440pF / 50dB gain; +10dB gain option; hybrid active/passive RIAA
• Fuse — 5×20mm 6.3A slow-blow
• Power consumption — 400W maximum
• Dimensions — 43.5 × 43 × 9.5 cm (W × D × H)
• Weight — 16 kg
• Finish — Silver or black; 15mm machined aluminum faceplate
• Origin — Handcrafted in Italy

Questions about how the Nuovo compares to the Unico Due or Unico 90, or which tube and fuse upgrades make sense for your system? We're happy to walk you through it.