Audio Research GSi75 Integrated Amplifier

The GSi75 utilizes four KT150 power tubes and two 6H30 driver tubes. Like all tube amplifiers, these will eventually need replacement, but the unit is designed for reliable operation and includes a user-friendly bias adjustment process to keep the tubes performing optimally.

Yes, the GSi75 is designed as a complete system hub. It features a dedicated phonostage with adjustable loading for turntables, alongside three RCA analog inputs and a high-resolution DAC with USB, RCA, and Toslink digital inputs.

The integrated phonostage is highly versatile, offering two gain settings—45dB for moving magnet cartridges and 62dB for moving coil cartridges. You can also fine-tune the impedance loading between 100, 200, 500, 1000, and 47k Ohms to perfectly match your specific cartridge's requirements.

Yes, the GSi75 includes a dedicated, high-quality headphone amplifier circuit designed to handle a wide range of headphones. It provides the same sonic character and tube-driven warmth as the main speaker output.

The internal DAC is capable of handling high-resolution digital files up to 2x DSD. This allows you to stream high-fidelity audio directly from your computer or digital transport with excellent clarity.

75 watts of tube power is substantial and typically sufficient for most high-quality bookshelf and floorstanding speakers. Because tube watts often sound more robust than solid-state equivalents, it will comfortably drive speakers with average to high sensitivity in most listening rooms.