Audio Research Reference 330M Debuts at High End Munich 2024: A Game-Changing Tube Amplifier
Audio Research has revealed a new contender in the high-powered tube amplifier realm, the Reference 330M, shown to the public during High End Munich 2024. Hints of its development suggested a direct lineage from earlier Reference models, yet it emerged with a fresh blend of design elements and carefully chosen new components. Its rated power clocks in at 330 watts per channel, aided by a fully balanced signal path and Pentode operation.
Underneath the chassis stands an ECC83 tube for voltage amplification, supported by bipolar transistors that preserve the tube character while maximizing input-stage headroom. Right behind it is a differential pair stage with a 6H30, biased through a DMOS current source, feeding an output section regulated by silicon carbide JFETs. This arrangement supplies the six KT170 output tubes with optimal quiescent current, enhancing dynamics and sonic refinement.
Leaned-on design features include a solid-state regulated front end coupled with tube regulation for the output tube shields and driver stage. A hefty Pi filter and choke keep the power supply ripple to a minimum, providing a clean backdrop. The amplifier’s single-ended and balanced inputs, along with 4 Ohm and 8 Ohm speaker taps, cater to different systems, while a 12 Volt trigger, fan-speed adjust, RS-232 control, and a tube hour meter round out the modern conveniences.
Everything suggests this model brings substantial power with the tonal richness of a heightened tube design. Its KT170 complement, advanced driver circuitry, and carefully tuned supply regulation promise the kind of all-encompassing sound typically strived for in high-end audio. Shipping is anticipated soon in both black and aluminum finishes, providing options for those seeking an immersive tube-based listening experience with considerable muscle under the hood.
