The NuPrime PRA-9X is a fully balanced preamplifier designed for ultra-low distortion (THD+N of 0.0004%) that includes a MM phono input and a 6.3mm headphone output. There are a variety of settings for matching different MM cartridges.

The input and output use a special audio Relay Switch, which has the lowest interference and highly accurate transmission, to switch the source. Line Outputs include four NuPrime’s new ultra-low distortion amplifier modules (THD=0.0004%) composed of MUSES8820 op-amp in a new amplifying circuit. It has excellent ultra-low distortion and high driving force characteristics.

The phono input has a variety of settings for input resistors and capacitors to match different MM cartridges. PRA-9X phono amplifier is a 2-stage RIAA amplifier that utilises NJR MUSES8820 audio quality op-amp to provide an accurate RIAA curve and low distortion at high amplification and performance.

Features:

• LP vinyl RIAA phono amplifier circuit, with adjustable input capacitance and impedance.
• Input and output fully balanced preamp.
• Utilizing the MUSES8820 bipolar-input dual op-amp module, PRA-9X can reproduce the presence of an orchestra as experienced in a symphony concert and the breathing sound of a player in a live music house.
• NuPrime’s next generation current booster circuit, providing top 0.0004% (7.5Vrms) THD performance and 114dB signal-to-noise ratio (S/N).
• High-performance headphone amp output.
• Input and output Trigger for power on/off control of multiple devices.

Specifications:

Inputs:

• 1 x Phono Stage
• 2 x Analog Stereo RCA
• 1 x Analog Stereo XLR
• 1 x Trigger IN (12V)

Outputs:

• 1 x 6.3mm Headphones out
  
• 1 x pair of Stereo RCA out
• 1 x pair of Stereo XLR out
• 1 x Trigger OUT (12V)

Phono Stage:

• Input resistance: 32K ohm / 47K ohm / 100K ohm
  
• Input capacitance: 100 pF / 220 pF / 320 pF
• MM Input Sensitivity: 4.0 mV @ 1KHz
• GAIN: MM input to LINE output (Vol./Max.) => 50dB @ 1KHz

PRE Stage:

• Input resistance: 20K ohm
  
• Output resistance: 10 ohm
• THD+N: 0.0004% @ 7.5V Vrms
• S/N ratio >115dB @ 7.5V Vrms
• Frequency Response: 0Hz to 50KHz (0.2dB), 200KHz (-3dB)
• GAIN: LINE input to LINE output (Vol./Max.) => 17dB @ 1KHz

Headphone Stage:

• Output power 560mW @ 32 ohm / 110mW @ 600ohm
• THD+N: 0.004% @ 32 ohm / 480mW, 0.0015% @ 600 ohm / 100mW
• S/N ratio >110dB @ 32 ohm / 450mW
• Frequency Response: 0Hz to 50KHz (0.2dB), 200KHz (-3dB)
  
• GAIN: LINE input to LINE output (Vol./Max.) => 17dB @ 1KHz
• Dynamic Range > 115dB

General:

• Dimensions (W x H x D): 235 mm x 55 mm x 281 mm
• Weight: 5.5 pounds (2.5 kg)
• Worldwide AC voltage: (90VAC~130VAC // 210VAC~250VAC) With Voltage Select Switch
• AC Fuse: Slow-blow, T1A, 250VAC
• Color: Black or Silver