Reference 330M Monoblock Power Amplifiers By Audio Research

The Audio Research Reference 330M monoblock amplifiers represent the pinnacle of high-end tube amplification, engineered to deliver extraordinary power, precision, and musical realism. Designed to drive even the most demanding loudspeakers with effortless authority, it combines exceptional control with breathtaking dynamic performance.

Built around an all-tube signal path, the Reference 330M features premium vacuum tube architecture from its ECC83 input stage to its KT170 output section, along with tube-regulated power supplies for enhanced purity and refinement. The result is a rare balance of commanding high-power output and the smooth, natural musicality typically associated with lower-powered tube amplifiers.

Listeners can expect remarkable tonal richness, expansive soundstage depth, and exceptional detail retrieval. The amplifier delivers a fluid, immersive presentation while maintaining razor-sharp precision and outstanding transient response when required. Frequency extension is impressive across the entire spectrum, offering deep, authoritative bass control alongside open, airy highs.

Ideal for statement-level audio systems, the Reference 330M is crafted for audiophiles seeking uncompromising performance, emotional musical engagement, and world-class tube amplification.

FEATURES:

• The 330M was designed to provide ultimate performance without worry.
• Auto bias assures rock-steady consistency, minute-by-minute, day in and day out.
• Output tube life is 3,000 hours, providing many years of listening pleasure.
• A fully-balanced design, the addition of single-ended inputs allows its compatibility with virtually any source.
• 12 volt triggers allow the 330M to be turned on remotely, just by powering up your Reference preamp or a master control.
• RS232 control.
• Auto-off control will turn 330M off if no signal is sensed in two hours (defeatable).
• Fan speed control.
• Tube hour meter.
• 4-8 ohm speaker outputs.
• Tube monitor.
• Meter light control allows dimming or off.
• Meter action switch allows meter needle to be turned off.

Stereophile
“My deepest gratitude to everyone at Audio Research. You’ve done Bill Johnson’s legacy proud. The Audio Research 330M is a great amplifier, more than worthy of Stereophile’s Amplifier of the Year award when award time next comes ’round in 2026 “

https://www.stereophile.com/content/audio-research-reference-330m-monoblock-power-amplifier

HiFi Pig
“Stunning looking amplifiers, we are big fans of the AR Ghostmeters!”

https://www.hifipig.com/audio-research-reference-330m-monoblock-amplifiers/

• Power Output: 330 watts
• Tube Biasing: Auto-Bias
• Output Taps: 4Ω, 8Ω
• Tube Complement:
  • (6) KT170 Power Output
  • (1) ECC83 & (1) 6H30 Input
  • (1) 6550 & (1) 6H30 Power Supply
• Inputs: XLR & Single-Ended
• Controls:
  • 12V Trigger
  • RS-232 Remote Control
• Power Saving: Standby Mode
• Weight: 101 lbs