Unison Research Reference Monoblock Power Amplifiers

The Unison Research Reference Monoblocks represent the flagship expression of the company’s valve amplification philosophy—large-scale single-ended triode-inspired designs engineered to deliver both the tonal richness of tube amplification and the dynamic authority required for demanding loudspeaker systems.

Handcrafted in Italy, these amplifiers combine traditional valve topology with substantial power supply engineering and distinctive industrial design. Featuring Unison Research’s signature blend of wood, polished metal, and exposed valve architecture, the Reference monoblocks are as visually striking as they are technically ambitious.

At their core is a fully balanced valve amplification circuit operating in a high-bias Class A configuration, designed to preserve harmonic integrity and tonal realism while maintaining exceptional current capability and loudspeaker control. Massive transformers and heavily over-specified power supplies form a fundamental part of the design, reflecting Unison Research’s long-standing focus on output transformer quality and power stability.

Specifications

• Type: Mono valve power amplifiers
• Amplifier Configuration: Fully balanced Class A valve design
• Power Output: 80W RMS into 6Ω
• Output Stage: Parallel single-ended topology

Valve Complement (per monoblock)

• 4 × 845 output valves
• 2 × ECC82 / 12AU7
• 2 × ECC83 / 12AX7
• 1 × ECC81 / 12AT7
• 1 × 6BX7

Inputs

• 1 × Balanced XLR
• 1 × Single-ended RCA

Outputs

• Speaker outputs for multiple impedance matching options

Electrical & Performance

• Frequency Response: 20Hz – 30kHz
• Output Impedance Taps: 4Ω and 8Ω
• Power Consumption: approx. 1000W

Physical

• Dimensions (per amplifier): 600 × 950 × 800 mm
• Weight (per amplifier): approx. 100 kg

The use of 845 transmitting triodes is central to the amplifier’s sonic identity. Known for their combination of tonal density, dimensionality, and dynamic scale, these valves allow the Reference monoblocks to deliver a presentation characterised by:

• expansive soundstage reproduction,
• natural harmonic structure,
• fluid midrange texture,
• and substantial low-frequency authority for a valve design.

Unlike many lower-powered single-ended triode amplifiers intended primarily for high-efficiency loudspeakers, the Reference monoblocks were engineered to provide sufficient drive capability for a far broader range of speaker systems, while retaining the tonal sophistication and immediacy associated with large triode valves.

The amplifiers’ enormous chassis and transformer assemblies are not merely aesthetic statements—they reflect the scale of the internal power supply and output transformer engineering required to achieve stable high-power Class A operation from large transmitting tubes.

A statement-level Italian valve amplifier—combining large-scale triode power, handcrafted construction, and uncompromising analogue musicality.

Sold as Pair, Units do not include Original Packaging