Audio Research Reference 330M
Monoblock power amplifier
The Audio Research Reference 330M Main 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.
Make music come alive in a way you will never forget.
The Reference 330M puts you right there, and does not let you forget that you are listening to a living performance captured in time, just waiting to be unearthed with no potential left unrealised.
The beauty, the emotion, the dynamics, the life are all there to conjure total immersion, whenever you want it.
A hand built masterpiece
The Reference 330M is the finest amplifier ever created by Audio Research, with the ability to control any loudspeaker with a vice-like grip and startling dynamic life. It is the culmination of everything they have learned over 50+ years.
It is a statement that music is king, always ready to sweep you away. Infusing new technology and circuits with the finest vacuum-tube architecture, the 330M elevates music reproduction to the highest plateau with an all-tube signal path.
From its ECC83 input to its KT170 output, with tube regulation in the power supply, the 330M proves that you can enjoy the ease of high power along with a delicacy and purity usually associated with low-power amplifiers. Tonal saturation and density accompany a specificity of recording space beyond anything they have built.
Liquidity and artistry abound, yet with blade-like edge precision when called for. Extension at both frequency extremes is state of the art even for solid state amplification. Statement-level loudspeakers capable of meaningful infrasonic bass output will be fully commanded down through their lowest octave without a hint of retreat. Stones unturned: None.
This is their heritage, the legacy created by the Audio Research founder, William Zane Johnson.
Audio Research Reference 330M Specifications
Power Output – 330 watts
Tube Biasing – Auto-Bias
Output Taps – 4Ω, 8Ω
Tube Compliment
(6) KT170 Power Output
(1) ECC83 & (1) 6H30 input
(1) 6550 & (1) 6H30 Power Supply
Inputs – XLR & Single-Ended
Controls – 12V Triggers, RS-232 Remote Control
Power Saving – Standby Mode
Weight – 101 Ibs (46kg) each
The company occupies a 48,000 square-foot, technically-advanced production plant and administrative headquarters in Maple Grove, Minnesota, where approximately 50 technical, assembly and support staff guide the product line from concept to finished goods. 
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