GFA-5800

About the GFA-5800

The Adcom GFA-5800 is a high-current, high-power stereo power amplifier designed by Nelson Pass, featuring an all-MOSFET signal path with no bipolar transistors. It delivers 250 watts per channel into 8 ohms with very low distortion (0.18% THD) and a wide frequency response from 10Hz to 20kHz. The amplifier uses a Class A front-end and Class AB power section, with a damping factor of 1100 and a gain of 29 dB. It is capable of driving low impedance loads with stability and offers a warm, musical sound with excellent detail, dynamic range, and control. The GFA-5800 is highly regarded for its ability to reproduce top-end air without fatigue, dynamic bass, and smooth midrange and treble. It is well-built with a giant toroidal transformer, precision resistors, and high-quality MOSFET output devices. The amplifier weighs about 25.6 to 27 kg and measures approximately 216 x 432 x 362 mm. It was introduced around 1993-1995 and is no longer manufactured. The unit is praised for audiophile sound quality and reliability but is also noted to be very honest to the source material, revealing flaws in poor recordings.