The Unison Research Sinfonia is a high-fidelity integrated valve amplifier that aims to deliver the purest sound experience through its Class-A design. With meticulous attention to the physics of audio reproduction, it sets a new standard in acoustic integrity.
The Unison Research Sinfonia utilizes a dual mono configuration, ensuring that each channel operates independently to eliminate crosstalk and interference, thereby delivering a clearer and more accurate sound. Its Class-A output stage, featuring KT88 tubes in parallel single-ended ultra-linear mode, allows for optimal linearity and minimal distortion, which is crucial for high fidelity. The amplifier incorporates rigorously selected and matched tubes, controlling the KT88 bias in real time to mitigate drift over time, which is essential for consistent sound quality. Additionally, the use of toroidal transformers in its power supply minimizes magnetic flux dispersion, contributing to improved transient response and overall efficiency. The unique design where external wooden components dampen resonance further enhances the amplifier's performance by reducing unwanted microphony effects.
Key Features
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Dual Mono Configuration: Each channel has its own dedicated power section, which reduces interference and enhances sound clarity.
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Class-A Output Stage: Operates in single-ended ultra-linear mode, providing excellent linearity and minimizing harmonic distortions.
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KT88 Tubes: Selected for superior performance and matched for consistency, ensuring a high level of reliability and sound quality over time.
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Toroidal Transformers: Designed for low magnetic flux dispersion, improving efficiency and dynamic response in audio output.
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Real-Time Bias Compensation: Maintains optimal operation of tubes, ensuring sustained sound performance even after prolonged use.
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Wooden Damping Structures: Reduces resonance, minimizing microphony effects from the vacuum tubes to deliver a purer audio signal.
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ALPS RK27 Potentiometer: Provides precise analog volume control, enhancing user experience and maintaining audio integrity.
Technical Specifications
- Type: Dual Mono/Stereo Integrated Valve Amplifier
- Output Stage: Single Ended Parallel Ultralinear Class-A
- Output Power: 25W
- Inputs: 4 Line, 1 Tape
- Input Impedance: 47 kOhm
- Outputs: 1 Tape, 1 Subwoofer, Loudspeakers Bi-Wiring
- Output Impedance: 4 – 8 Ohm
- Feedback Factor: 14dB
- Frequency Response: 20 – 30000 Hz
- Valves: 4 x 6550/KT88, 2 x ECC82, 2 x ECC83
- Remote Control: IR Inputs and Volume
- Power Consumption: 500W Max
- Dimensions: 44 x 42 x 21 cm
- Net Weight: 55 lbs
