Aurorasound HFSA-02 Tube Stereo Integrated Amplifier

Aurorasound HFSA-02 Tube Integrated Amplifier - Remote included

The HFSA-02 is a newly developed, fully tube-based integrated amplifier featuring ECC83 and ECC82 tubes in the input stage and a push-pull output section built around EL34 power tubes. Every part of the design emphasizes premium components, precision engineering, and careful hand-assembly.

This is a traditional pre–main amplifier constructed exclusively with vacuum tubes. It employs ECC83 and ECC82 valves at the front end and an EL34 push-pull output stage paired with Lundahl output transformers in an ultralinear configuration, producing 31W + 31W per channel. A 22 mm solid maple frame combined with a 4 mm machined aluminum top plate gives the chassis exceptional rigidity and stability, preventing unwanted vibration. This robust structure supports both the substantial transformers and the delicate vacuum tubes, enabling a very fine timbre balance of rare elegance. Crafted with meticulous attention to detail, the HFSA-02 is designed to excel with today’s high-resolution digital sources while obviosly also offering superb results with analog playback. Built for long-term enjoyment, it is a genuine high-end tube amplifier engineered to remain a reliable musical partner for decades.

Features
As a standard pre–main unit, the amplifier offers four RCA line-level inputs and a master volume control. Three alternative configurations are available:

A. One XLR input + three RCA inputs

B. One MM phono input + three RCA inputs

C. RCA/XLR input for use as a dedicated power amplifier (no volume control or input selector)

The rear panel can be swapped to match the chosen configuration, either at purchase or later on. Component selection includes resistors from Vishay, PRP, and TAKMAN (Japan); WIMA film capacitors (Germany); and electrolytic capacitors from TDK-EPCOS. All parts are chosen with strict attention to performance and long-term reliability. Aurorasound commissions custom power and choke transformers from Japanese manufacturers, and the rectifier uses a ROHM silicon-carbide diode, chosen for its extremely low noise and outstanding voltage handling. Terminals feature thick, high-quality gold plating. The EL34 output tubes operate with an auto-bias circuit, simplifying maintenance and allowing tube replacements from other manufacturers without manual bias adjustment.

TECHNICAL SPECIFICATIONS

• Inputs: Standard: 4 × RCA line

• Option A: XLR + 3 RCA
  Option B: 1 × MM phono, 3 × RCA line
  Option C: 1 × XLR/RCA input (no volume control, no selector)

• Input sensitivity: 31 dB, 440 mV

• Input impedance: 25 kΩ

• Output power: 31 W + 31 W @ 8 Ω

• Frequency response: 10 Hz – 30 kHz (–3 dB)

• THD+N: 0.1% at 1 kHz

• SNR: 98 dB, A-weighted

• AC mains voltage: Europe/Asia: 240 V / 230 V; USA: 120 V
  Power consumption: 200 W

• Dimensions / Weight: 440 × 290 × 228 mm (excluding knobs/terminals); 20 kg