Unison Research PhonoOne

The Unison Research PhonoOne delivers a pure and unaltered sound that reflects the true essence of music. Its carefully engineered circuit design ensures a listening experience embedded in acoustic authenticity.

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The Unison Research PhonoOne employs a pure Class A design focusing on low distortion and high fidelity. With a gain of approximately 54dB, it is capable of handling both MM and most MC cartridges by utilizing five ECC83/12AX7 double triodes arranged in a parallel configuration to minimize noise and maximize output quality. The passive RIAA equalization circuit is finely tuned with selected components for stringent tolerances, ensuring accurate reproduction across a wide frequency range. Additionally, the preamplifier incorporates a specialized delayed muting function to prevent audible transients during warm-up and shutdown, while independent RC filters near each gain stage significantly reduce crosstalk—even at low frequencies. This meticulous attention to layout and design principles guarantees a truly natural sound with exceptional channel separation and interference rejection.

Key Features

• **Parallel Triode Configuration**: Enhances gain and reduces noise levels, resulting in a cleaner output.
• **Passive RIAA Equalization**: Ensures a precision equalization curve with tightly controlled tolerances for accurate frequency response.
• **Delayed Muting Function**: Prevents loud pops by muting the output until operating conditions are optimal, protecting both the user’s equipment and ears.
• **Customizable Input Matching**: Both resistance and capacitance can be tailored to match various cartridges for optimal performance.
• **Independent RC Filter Cells**: Minimize crosstalk at low frequencies by over 20dB compared to previous designs, allowing for a clearer audio signal.
• **Hand Soldered Wiring**: Uses shielded wire for signal integrity, further improving overall sound quality and reliability.

Technical Specifications

• Type: Stereo Phono Valve Preamplifier
• Class: Pure A
• RIAA: Passive +/- 0.1 dB (20 Hz / 20 KHz)
• Output Impedance: 800 ohm
• Outputs: 1 x Line
• Gain: 54 dB
• Total Harmonic Distortion (THD): 0.1% at 1 volt output
• Signal to Noise Ratio (S/N): -80 dB
• Inputs: 1 per MM or MC Cartridge
• Input Impedance: 47 Kohm – 100 – 50 – 22 ohm / 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: 3.6 Kg (including power supply)

We ship via specialized freight carriers who understand the value of your investment. Your equipment arrives fully insured and ready to integrate into your system. Delivery typically occurs within 5-7 business days.

Due to the precise nature of high-end acoustic equipment, returns are accepted within 14 days of delivery. Items must be in flawless, factory-new condition and in their original packaging. Please note that unsealed equipment is subject to a restocking fee, and return freight is the responsibility of the buyer.