The Unison Research SimplyPhono delivers an authentic analog experience through its all-tube circuitry. Designed for precision, it ensures that the acoustic truth of your vinyl records is faithfully reproduced without compromise.
The Unison Research SimplyPhono utilizes a pure Class A design without global or local feedback. It employs four ECC83/12AX7 tubes, arranged to optimize gain and minimize distortion, particularly through an ionic bias configuration that prevents cathode self-polarization effects. The RIAA equalization network is implemented passively, using strictly toleranced resistors and carefully selected capacitors to achieve a precision of 0.1dB across the audio spectrum from 20 Hz to 20 kHz. The design incorporates a high anodic supply voltage providing a stable low ripple power source exceeding 300V, while additional filtering and zener regulation minimize cross-talk and power supply rejection in the critical gain stages. The symmetrical layout further enhances performance by reducing noise and improving audio fidelity, as evidenced by a measurable 20dB improvement in cross-talk at mid-band frequencies.
Key Features
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Pure Class A Operation: Ensures linear amplification without the coloration that feedback can introduce, preserving the original sound quality.
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Ionic Bias Configuration: This design prevents unwanted local reverse effects, allowing for greater accuracy and lower distortion levels in audio playback.
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Passive RIAA Equalization: The use of high-quality components and a passive approach leads to minimal alteration of the musical signal, maintaining its integrity.
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Precision Components: Handpicked resistors and capacitors achieve a frequency response tolerance of 0.1dB, ensuring accurate audio reproduction.
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High Voltage Power Supply: Stabilizes the operating conditions for each tube stage, enhancing dynamic response and low noise operation.
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Symmetrical Layout: Reduces cross-talk and noise, significantly improving overall audio clarity and separation.
Technical Specifications
- Type: Stereo Phono Valve Preamplifier
- Class: Pure A Class
- RIAA: Passive +/- 0.2 dB (20 Hz / 20 kHz)
- Output Impedance: 800 ohms
- Output: 1 x Line
- Gain: 52 dB
- Total Harmonic Distortion (THD): 0.4% at 1 Volt output
- Signal to Noise Ratio (S/N): -72 dB
- Inputs: 1 x MM or MC Phono Input
- Input Impedance: 47 kOhm, adjustable to 22 ohm / 100 pF
- Feedback Factor: 0 dB
- Valves: 4 x ECC83 / 12AX7
- Power Supply: External
- Dimensions: 140 x 290 x 105 mm
- Net Weight: 3 kg (including power supply)
