Unison Research uPhono+ Phono Preamplifier

The uPhono+ is a multifunctional phono preamplifier with a high-resolution A/D converter as well as three digital outputs and a high-impedance headphone amplifier.

uPhono+ Digital features:

• USB 24bit/96kHz max. to transfer your records to your PC in the highest sound quality.
• Toslink (96kHz) D/A output
• S/PDIF (96kHz) digital coaxial output
• A/D conversion Cirrus Logic CS5341 IC
• USB transmission Bravo SA9137 IC
• Optical and coaxial transmission TI DIT4096 IC

uPhono+ Analogue Features:

• Moving Magnet (MM) Gain: 38dB @ 1kHz
• Moving Coil (MC) gain 58dB or 69dB @ 1kHz adjustable by micro switch
• MM input with 5 adjustable capacitances (100/200/320/420pF) + 1nF
• MC input with 7 adjustable impedances (5/10/25/100/250/500/1kOhm)
• Fixed output level and variable headphone output
• Volume control of the headphone output via high-quality Alps® "Blue Velvet" potentiometer
• Headphones from 16 to 600 ohms can be connected
• Switchable subsonic filter
• Modern circuit design using SMD technology
• Separate power supply for analogue and digital section

TECHNICAL SPECIFICATION

• Analogue inputs: Analogue inputs switchable for all MM, highoutput MC and ultra-quiet MC systems    
• Analogue outputs: Fixed output level, variable headphone output.
• Headphones (16-600Ω): (6.35mm) jack plug    
• Digital outputs: USB B-port - connection to PC (24bit/96kHz), optical digital, coaxial digital    
• Input impedances:   MM 47kΩ + 100/200/320/420nF, MC 5/10/25/100/250/500/1kΩ + 1nF.
• Gain at 1kHz:  MM 38dB, MC 58dB / 69dB adjustable
• Nominal output level: 316mVRMS (-10dBV)    
• Input sensitivity for nominal output level: MM 3.36mVRMS, MC (58dB) 0.336mVRMS, MC (69dB) 0.1mVRMS
• Signal-to-noise ratio: MM -80dB, MC (58dB) -64dB, MC (69dB) -60dB
• RIAA accuracy: +/- 0.3dB from 20Hz to 30kHz    
•  Subsonic filter: -3dB at 20Hz and 6dB/octave    
• Overload resistance: 30dB    
• Distortion at 1kHz:   MM 0.018% (10mV in) RMS, MC (58dB) 0.12% (1mV in) RMS, MC (69dB) 0.12% (1mV in) RMS
• Line output impedance: Fixed 824Ω, Variable 824Ω
• Headphone amplifier stage: Output level 2.18V RMS max, THD+N 0.07% (1kHz /32Ω)
• USB A/D: Resolution 16/24 bit, Sample rates - 8, 16, 32, 44.1, 48, 88.2, 96kHz
• Coaxial digital output 0.5Vp-p a 75Ω / 96kHz max.    
• Mains voltage: 220-240V AC or 100-120V AC country dependent.    
• Dimensions: HxWxD 82,5mm x 216mm x 251mm including feet, connectors and knob.    
• Weight 2,8 Kg