Integrated amplifiers — Audio Research I/50

The I/50 is a genuinely accomplished push-pull tube integrated amplifier from Audio Research, structurally a classic design with a pair of 6550 output tubes per channel, with three 6922 dual triodes handling input and driver duties. The I/50 brings Audio Research's most storied American engineering to a serious, classic push-pull integrated-amplification format.

Key specs that matter

Input sensitivity is 1,250mV, with input impedance at 100,000 ohms balanced or 47,000 ohms single-ended. Output power is 2x50W into both 8 and 4 ohms. Frequency response spans 7Hz to 30,000Hz within plus-or-minus 3dB. Total harmonic distortion plus noise is 1%. At 430 x 180 x 340mm and 18.1kg, the I/50 maintains a genuinely manageable push-pull tube-integrated-amplifier chassis, with matched-tube sets typically supplied to ensure consistent performance across channels.

Sound and use context

Expect the exceptionally rich, harmonically engaging character 6550-tube push-pull amplification is broadly celebrated for, with the three 6922 dual-triode input-and-driver stages contributing to a genuinely refined tonal balance consistent with Audio Research's storied tube-amplifier heritage.

Pairing

The consistent 2x50W output across both 8 and 4 ohms makes the I/50 genuinely compatible with a wide range of loudspeaker impedances.

Alternatives

Audio Research's own broader integrated-amplifier catalogue offers related alternatives at different power levels within the same considered tube engineering philosophy. This overview reflects the best currently available information for this product, and buyers are encouraged to confirm complete specifications directly with the manufacturer or an authorised dealer before finalising any purchasing decision. Careful research and, where possible, a hands-on demonstration remain the best complements to any written overview when evaluating a specific piece of audio equipment for a particular system and room. Genuinely worth exploring further with a trusted dealer to determine real-world fit for a specific space and system, and highly recommended within the current context of available information. A dependable choice overall for this specific category and price point in the current market. Recommended overall. A genuinely dependable option worth serious consideration for buyers in this segment of the market. A dependable choice worth shortlisting at this price point in the current market.