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 unrealized. The beauty, the emotion, the dynamics, the life are all there to conjure total immersion, whenever you want it.
 
The Reference 330M is the culmination of everything we 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 partial 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.
 
Our in-house engineering team designed custom capacitors, wiring, transformers, four-layer circuit boards, and other parts to create the 330M. Every unit is built by hand, from hand-soldering every component into each board, to laser-etching and installing motor mechanisms in each GhostMeter®, and listening to each product in a reference system as a final quality check. This is our heritage, the legacy created by our founder, William Zane Johnson.
 
The Reference 330M is the finest amplifier ever created by Audio Research. Words cannot express the profound musical experience that it conveys, the 330M must be experienced to understand its peerless performance. Leave your preconceptions of what is possible behind.
 
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.