NuPrime PRA-9X Preamplifier

NuPrime PRA-9X is a pre-amplifier with a fully balanced design and includes a MM phono input. The input and output use a special audio Relay Switch, which has the lowest interference and highly accurate transmission, to switch the source.

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.

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.

Precision Volume Control
The PRA-9X features digitally controlled volume adjustment with fine 0.5dB steps and memory recall. It uses high-conductivity analog switches and integrates high-precision internal chip resistors. Unlike conventional digital attenuation, each volume step activates a dedicated analog switch, minimizing audio degradation and preserving sound quality.

This design delivers exceptional channel separation and ultra-low harmonic distortion, achieving outstanding performance with a signal-to-noise ratio (S/N) of 114dB and total harmonic distortion (THD) of just 0.0004%. These characteristics ensure high-fidelity electronic volume control.

The system employs independent 4-channel volume control (L+/L-, R+/R-) for a true fully balanced architecture.

At this price point, a fully balanced high-end preamp like the PRA9X is a rare find, offering unmatched cost-performance (C/P) value and exceptional overall 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.

Inputs:
1 x Phono Stage
2 x Analog Stereo RCA
1 x Analog Stereo XLR

Outputs:
1 x 6.3mm headphones out
1 x pair of stereo RCA out
1 x pair of stereo XLR out

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:
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

Dimensions and Weight:
Worldwide AC voltage: (90VAC~130VAC // 210VAC~250VAC) With Voltage Select Switch
AC Fuse: Slow-blow, T1A, 250VAC
Product Dimension:  55 x 235 x 281 mm (H x W x D)
Package Dimension: 80 x 390 x 360 mm (H x W x D)
Product Weight: 3kg
Package Weight: 4kg