Audio Research

I/50

The Audio Research I/50 is a vacuum-tube integrated amplifier delivering 50 watts continuous output per channel from two matched pairs of JJ 6550 tubes, with three 6922 tubes serving as one input and two driver stages. It provides two RCA and one XLR line-level inputs, 4- and 8-ohm speaker taps, and a ¼-inch headphone output; optional modules add a 42 dB phono stage compatible with moving-magnet and high-output moving-coil cartridges and a DAC with USB, Toslink, coaxial, and Bluetooth inputs. The amplifier uses a Cerakote-finished aluminum top plate, integrated LexieTube display tubes, and measures 16.5 × 7.25 × 13.5 inches, weighing 40 pounds.