Audio Research Reference 330M Mono Amplifier

The Reference 330M is unique, combining new thinking, new design, and new parts with the best concepts from other Reference amplifiers. All gain is accomplished using vacuum tubes; transistors are only used for impedance buffering. OVERVIEW The Reference 320M amplifier was originally imagined to be a larger, more powerful version of the Reference 160M amplifier, but it turned out to be a more sophisticated amalgam of designs incorporated in other Reference amplifiers. What was shown in 2022 was a concept, not a product. The 330M is a very different beast, producing 330 watts per channel. FEATURES The new front end borrows its architecture from the 610T, using an ECC83 tube for voltage gain. The ECC83 output is buffered using special bipolar transistors that have tubelike qualities. Bipolar buffers allow us to maximize the input stage headroom and preserve the best sonic qualities of the ECC83. The second stage is the classic circuit used in the 610T and 250, with a 6H30 tube different