Unison Research Triode 25 Black Edition Integrated Tube Amplifier
Best tube amplifier for audiophiles seeking versatile, high-fidelity sound performance.
The Unison Research Triode 25 Black Edition is a distinguished integrated tube amplifier, evolving from celebrated previous models. It features a robust push-pull circuit with EL34 output tubes for superior power and efficiency, minimizing distortion. Users can select between Pentode mode for up to 45 watts per channel or Triode mode for a refined 25 watts per channel. This design ensures high-quality audio reproduction tailored to various listening preferences, offering a blend of power and sonic refinement.
$4499.00
Owner Satisfaction
4.8
/ 5
Category Rank
167
/ 1683
#167 in Power Amplifiers
Price vs Category Average
-46%
Below average
Output Stage
Push-pull, ultralinear, Class-AB
/ Push-pull, ultralinear, Class-AB
Who it's for
- Music lovers prioritizing long-term, fatigue-free listening sessions
- Audiophiles seeking both intimate warmth and powerful dynamic range
- Design-conscious listeners wanting a beautiful, high-end centerpiece
Who should skip it
- Budget-focused buyers wary of recurring maintenance expenses
- Owners of low-sensitivity speakers requiring high-wattage amplification
- Users with limited space or enclosed furniture setups
Performance breakdown
Sonic Versatility
Switchable Triode and Pentode modes offer distinct, high-fidelity sound profiles.
Power Delivery
Robust 45-watt output handles demanding speakers with impressive authority and control.
Distortion Control
Advanced push-pull circuitry maintains exceptional clarity even at higher volume levels.
Build Integrity
Substantial 20kg chassis ensures long-term stability and resonance-free audio performance.
Tube Efficiency
Optimized design extends EL34 lifespan while delivering consistent, warm harmonic richness.
Connectivity Precision
Standardized RCA and banana plug inputs ensure seamless integration with high-end systems.
Key Specs
Output Stage
Push-pull, ultralinear, Class-AB
Maximum Output Power
Approx. 45W per channel (Pentode)
Valve Complement
2 x ECC83, 1 x ECC82, 4 x EL34
Output Impedance
6 Ohm
Input Impedance
47 kOhm / 50 pF
Net Weight
20 Kg
Dimensions
30 cm x 45 cm x H. 20cm
Maximum Power Consumption
300 watts
Features
- Switchable Triode and Pentode operation
- High output power in Pentode mode
- Push-pull circuit minimizes distortion
- Ultralinear Class-A/B amplification
- Symmetrical output transformer design
- Extended tube lifespan
- Utilizes EL34 output tubes
What customers say
The Unison Research Triode 25 Black Edition is overwhelmingly praised for its deeply musical sound signature, characterized as warm and lush. Reviewers consistently note its ability to produce an expansive, detailed soundstage that offers palpable realism. A key feature is the versatile switchable triode and pentode modes, allowing users to tailor the sonic character for different listening needs. Beyond performance, the amplifier earns high marks for its robust Italian craftsmanship and premium aesthetic, suggesting heirloom quality. Despite its enthusiast pricing, the consensus is that the Triode 25 delivers exceptional value, matching the performance of much costlier equipment. It is highly recommended for serious audiophiles seeking profound sonic rewards.
Know before you buy
The Triode mode offers 25 watts per channel for a more refined, intimate sound, while the Pentode mode increases power to 45 watts per channel for greater punch and dynamics. You can easily switch between these modes to match your specific speakers or listening preferences.
Yes, the Triode 25 is designed with tube longevity in mind, and the EL34 tubes are standard components that are widely available. Replacing them is a straightforward process, though we recommend following the manual's guidance on biasing to ensure optimal performance.
The amplifier features a 6-ohm output impedance, which makes it compatible with a wide range of bookshelf and floorstanding speakers. Given its 45-watt output in Pentode mode, it performs best with speakers of average to high sensitivity.
The unit measures 30 cm by 45 cm with a height of 20 cm and weighs 20 kg. Because it is a tube amplifier, it is important to place it on a sturdy surface with adequate ventilation space above and around the chassis to allow heat to dissipate properly.
No, the Triode 25 is an integrated amplifier, meaning it combines both the pre-amplification and power amplification stages in one chassis. You can connect your source components, such as a CD player or DAC, directly to the RCA inputs on the back.
The push-pull design is engineered to minimize distortion while maintaining the warmth and harmonic richness associated with tube amplification. It provides a balanced, detailed sound that avoids the harshness sometimes found in solid-state designs.
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