I/50

Audio Research I/55 is a compact tube integrated amplifier derived from I/70, succeeding I/50, targeting high-end listeners seeking classic tube sound with modern connectivity.

Fully tube-based amplification uses matched pairs of 6550 output tubes and 6922 input/driver tubes, adding Auto-Bias for continuous idle-current control without manual adjustment.

Rated at 2 × 50 W, the upgraded tube preamp offers wider gain range, stronger dynamics, Pre-Out outputs, and improved control with demanding loudspeakers.

The Audio Research I/70 integrated amplifier, part of the 'I' series, targets discerning audiophiles with enhanced performance and user-friendly features.

Initially designed with 6550 power tubes, the production model now incorporates KT120 tubes, improving transparency, dynamics, texture, spatiality, and tonal quality.

This model is positioned as a significant advancement over its predecessor, the I/50, offering 70 watts per channel output.