Audio Research REF 150 Power Amplifier

The Audio Research Reference 150 is a high-end stereo valve power amplifier engineered to deliver the natural musicality and transparency that have made Audio Research one of the world’s most respected names in tube amplification. Rated at 150 watts per channel, it combines a robust output stage with carefully regulated power supplies and precision valve circuitry to provide effortless dynamics, exceptional detail, and outstanding control across a wide range of loudspeakers.

Built around KT120 output tubes, the REF 150 offers greater power reserves and improved reliability over previous generations, while retaining the rich tonal character and expansive soundstage that define Audio Research’s Reference Series. The amplifier also incorporates user-adjustable bias controls and an integrated tube hour meter, making routine maintenance straightforward and ensuring optimum performance over the life of the valves.

Specifications

Amplifier Design

• Stereo vacuum tube power amplifier
• 150 Watts per channel continuous output
• Push-pull valve output stage

Valve Complement

• 4 × KT120 output tubes
• 2 × 6H30 driver tubes
• 2 × 6H30 input tubes

Performance

• Power Output: 150W per channel continuous
• Frequency Response: 0.5Hz – 110kHz (–3dB)
• Power Bandwidth: 7Hz – 70kHz
• THD: Less than 1% at rated output
• Input Sensitivity: 2.4V RMS balanced for rated output
• Input Impedance:
  • 300kΩ balanced
  • 150kΩ single-ended

Inputs

• 1 × Balanced XLR stereo input
• 1 × Single-ended RCA stereo input

Speaker Outputs

• 4Ω output taps
• 8Ω output taps
• 16Ω output taps
• Heavy-duty binding posts

User Features

• Front-panel power switch
• Power status LED
• Adjustable output tube bias
• LCD tube hour meter
• Adjustable cooling fan speed
• Tube cage supplied

Physical Specifications

Dimensions (W × H × D)

• 480 × 267 × 495 mm
• (18.9 × 10.5 × 19.5 in)

Weight

• 34.5 kg (76 lbs)

The Reference 150 is designed for discerning audiophiles seeking the refinement and musical engagement of valve amplification without compromising on power. Its combination of high-current KT120 output tubes, wide bandwidth, and meticulous engineering enables it to reproduce music with exceptional clarity, dynamic authority, and natural tonal balance.

A reference-grade stereo valve power amplifier delivering 150 watts per channel, premium KT120 output tubes, and the unmistakable sonic character of Audio Research for uncompromising high-fidelity performance.