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NuPrime HPA-9

$1,000.00

NuPrime HPA-9

$1,000.00

A pure Class-A headphone amp and preamp with low temporal distortion and lifelike sound

The NuPrime HPA-9 is a pure Class-A headphone amp and preamp with low temporal distortion and lifelike sound. The single-ended Class-A design and non-feedback output stage are capable of handling wide fluctuations and range of headphone impedances from 16 to 1000 ohms.

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SKU: NP-HPA-9 Category:

Description

To drive high impedance headphones properly, simply increasing headphone-amp power is insufficient. A brute- force, high-power design can cause the headphones to be played too loud. Consequently, this may result in long-term hearing loss. By providing large, instantaneous amounts of power through 30400uF capacitor array, a pure, Class A design of a high current and low impedance output stage, the HPA-9 is able to drive high-impedance headphones with ease while providing just the required amount of power for high efficiency earphones.

 

Innovative Designs

The following design features allow HPA-9 to outperform majority of the headphone amps on the market costing many times more.

JFET Input Stage: The single-ended JFET (Junction Field Effect Transistor) structure is powered by voltage with the characteristics of a solid-state semiconductor very much like a vacuum tube. The HPA-9 therefore produces a sound very close to a triode’s. The high 2nd harmonic also contributes to the sound’s warmth and neutrality, with an especially rich midrange.

The amplification circuit: The HITACHI 2SA872 and 2SC1775 transistors are no longer in production. However, we managed to acquire sufficient inventory for HPA-9. We have chosen these transistors because of three important features of a small-signal amplification transistor: high HFE for high current capability to power hard-to-drive headphones, wide bandwith (FT) and low output capacitance (low COB). Hence, the result is a natural, high-resolution, detailed and wide-bandwidth sound.

Non-feedback, pure Class A output stage design: Non-feedback design with very low nonlinear distortion is difficult to accomplish, but when achieved, provides a smooth sonic characteristic. The HPA-9 uses a 40W transistor specification for the output stage and an extremely precise KOA 0.1R.13W resistor with ideally quiet current consumption. Such an innovative design makes the HPA-9 a one-of-a-kind headphone amp.

The HPA-9 uses twelve 2200uF capacitors to form a capacitor bank array which provides 30400uF of reserved power capacity (including auxiliary capacitors). We are not aware of any other headphone amp using such a design, typical rather of high-end power amps. The massive capacitance array thus provides abundant power to drive any high-impedance headphone.

 

Inputs

  • One pair of RCA Phono Stage
  • Two pairs of Analog Stereo RCA

 

Outputs

  • One 3.5mm Stereo Socket
  • Two 6.3mm Stereo Sockets
  • Two pairs of Analog Stereo RCA

 

Specifications

  • THD+N:  < -110 dB (1 kHz / maximum gain)
  • Frequency Response: 0 Hz to 200KHz (-3dB)
  • Dimensions: 235 mm W x 281 mm D x 55 mm H (including feet)
  • Weight: 2.5kg
  • Worldwide AC voltage: (90VAC~130VAC // 210VAC~ 250VAC) with Voltage Select Switch
  • AC Fuse: Slow-blow, T1A, 250VAC
  • Available in Black or Silver color

Additional information

Color

Black, Silver

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