Audio Research - SP9MKII Preamplifier

Magnificent valve stereo preamplifier Audio Research SP9 MKII, in perfect condition, like new, tested and working, weight 6.5 kg. Height: 14 cm, width: 40 cm, depth: 28 cm. Hybrid type - frequency response: 10 - 30,000 Hz. Harmonic distortion: < 0.01%. Sensitivity/impedance. Phono gain: 66 dB. Made in the USA. with careful packaging and double protection. Estimated shipping weight: 9 kg, dimensions: height 16 cm, width 50 cm, depth 28 cm. Color: Black, Year of Construction 1991

Fully serviced and all valves replaced on 09-02-2026 by a qualified technician.

• Advanced hybrid technology: Combines the warmth and musicality of tubes with the speed and dynamics of the best solid-state designs.
• Exceptional tube life: Tubes are used conservatively for a service life of up to 10,000 hours, ensuring reliability and low maintenance.
• Optimized circuit design: An integrated regulated power supply with shielded toroidal transformer minimizes mechanical noise and interference.
• Source versatility: Excellent performance with vinyl thanks to the optimized phono section, as well as with modern sources like CDs and streaming.
• High-quality components: Each active and passive component is selected to minimize sonic degradation.
Specifications:
• Frequency response: ±0.5dB from 5 Hz to 50 kHz; phono section compatible with the RIAA curve with ±0.3dB from 30 Hz to 40 kHz.
• Total Harmonic Distortion (THD): Less than 0.1% at 2V RMS, with typical values below 0.005% in the midband.
• Input impedance: 50K ohm for line inputs; 47K ohm for phono inputs.
• Vacuum tubes: (2) 6DJ8/ECC88.
This preamplifier offers a perfect balance between valve warmth and solid-state dynamic precision. Ideal for those seeking high performance and versatility in a compact, practical format. It is particularly suitable for those wanting natural sound with maximum flexibility for both analog and digital sources.