Unison Research Phono One Tube Preamplifier

The Unison Research Phono One has always been a beloved choice among audiophiles, earning a reputation for its timeless design and superior sound quality. Recognizing the continuous demand for this classic, Unison Research has reintroduced the Phono One, blending the cherished aesthetics of the original with modern technological enhancements that push the boundaries of audio fidelity.

Key Features

• Ten Triode Design: Utilizes 5 ECC83/12AX7 double triodes in parallel for reduced noise and distortion.
• 54dB Gain: Compatible with all MM and most MC cartridges, providing ample amplification.
• Precise RIAA Equalization: Features a passive network with carefully selected components for accurate sound reproduction.
• Selectable Input Impedance: Allows matching of resistance and capacitance to your cartridge for optimal performance.
• Advanced Power Supply Design: Independent RC filter cells minimize cross-talk and enhance channel separation.
• Handcrafted Quality: Includes hand-soldered wiring, oversized power components, and enhanced cooling for long-term reliability.

About Unison Research

Unison Research, founded in Italy, has a long-standing reputation for crafting high-fidelity audio equipment that marries traditional craftsmanship with cutting-edge technology. Each product reflects their passion for music and dedication to producing equipment that delivers both sonic excellence and visual beauty. 

Timeless Design Meets Modern Engineering

While the exterior of the Phono One remains faithful to its original, elegant form, the internal circuitry has been significantly upgraded. The inclusion of ten triodes (5 ECC83/12AX7 double triodes) configured in parallel achieves exceptional noise reduction and distortion control. This enhancement also boosts the overall gain to approximately 54dB, making it versatile for use with a wide range of cartridges.

The Phono One employs a meticulously selected passive RIAA network, ensuring precise adherence to the equalization curve. Upgraded output capacitors further improve bandwidth and minimize phase rotation at low frequencies, delivering a sound that's both expansive and intricately detailed.

Precision and Flexibility

Understanding the critical nature of cartridge matching, the Phono One offers selectable input resistance and capacitance, allowing for a tailored fit to any cartridge’s requirements. A dedicated spot on the PCB is reserved for custom resistor values, ensuring that even the most discerning audiophiles can fine-tune their setup for optimal performance.

The power supply design is another area where the Phono One excels. With independent RC filter cells for each gain stage, it dramatically reduces cross-talk, achieving nearly immeasurable low-frequency interference at less than -90dB. This meticulous attention to detail extends to the layout design, which enhances channel separation and interference rejection, culminating in an audio experience of exceptional natural detail and musical clarity.

Craftsmanship Without Compromise

Every aspect of the Phono One reflects Unison Research’s commitment to quality. From the hand-soldered signal wiring to the placement of tubes designed to minimize microphonic distortions, no detail has been overlooked. Oversized power components and proper cooling measures ensure long-term reliability, making the Phono One not just a piece of equipment, but a lasting investment in high-fidelity audio.

The Listening Room Difference

Your listening space is unique, and so are your needs. That's why we take the time to understand your preferences, your room acoustics, and your sonic dreams. We'll guide you through our range of hi-fi options, ensuring you find the perfect match for your space and budget. We believe in personal connections, exceptional service, and expert advice because when it comes to sound, there's no one-size-fits-all solution. Contact us to learn more.

Specifications

• Type: Stereo Phono Valve Preamplifier
• Class: Pure A
• RIAA: Passive +/- 0.1 dB (20 Hz - 20 kHz)
• Output Impedance: 800 ohms
• Outputs: 1 x Line
• Gain: 54 dB
• Total Harmonic Distortion (THD): 0.1% at 1V output
• Signal to Noise Ratio (S/N): –80 dB
• Inputs: 1 per MM or MC phono cartridge
• Input Impedance: 47 kOhm, 100, 50, 22 ohms / 100, 200, 320, 420 pF (modifiable)
• Feedback Factor: 0 dB
• Valves: 5 x ECC83 / 12AX7
• Power Supply: External
• Dimensions: 37.3 x 5.84 x 24.63 cm
• Net Weight: Approx. 3.6 kg (including power supply)