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Excellent Working Condition with Low hour home studio use.Sold as Pictured.Some minor scuffs and scratches but overall, a really nice piece. Fast Free Shipping to the lower 48 USThanks!Power output: 200 watts per channel into 8Ω (stereo), 600 watts into 8Ω (mono)Frequency response: 10Hz to 20kHzTotal harmonic distortion: 0.09%Damping factor: 800Gain: 27 dBInput sensitivity: 1.75VSignal to noise ratio: 110dBSemiconductors: 42 x transistors, 2 x zener diodes, 13 x diodes, 2 x IC, 2 x diode bridgesDimensions: 185 x 432 x 310mmWeight: 16kg
USD 699 is a bit ambitious versus the recent used market, sitting above the US$687 75th percentile and well over the US$550 median, so it needs to justify itself with notably strong condition or extras.
That said, the GFA-555 is a respected high-current muscle amp with a real following for drive, grip, and a big, effortless presentation, so a clean example can still be worth chasing. The upside is strongest if this is an original-owner unit, fully tested, with no noise, no channel imbalance, and ideally fresh service history; at this price, buyers should want confidence that the power supply and output stage are healthy and that nothing obvious is missing.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
ADCOM emerged in the 1970s as a family-owned American audio venture founded by audiophile Newt Channin, initially focusing on exceptionally musical moving-coil phono cartridges that set it apart from typical entrants. The brand quickly pivoted to electronics with the groundbreaking GFA-1 power amplifier in 1979, delivering 200 watts per channel and robust current for demanding speakers, propelling ADCOM into prominence during the high-fidelity boom of the 1980s and 1990s.
The company built its legacy on high-performance amplifiers, including the Nelson Pass-designed GFA-555 that garnered worldwide acclaim, alongside AV tuners, preamps, and multichannel power amps like the GFA-6000 tailored for home theater. While early roots lay in phono gear, ADCOM specialized in electronics offering superior sound quality without extravagant pricing, eschewing speakers, headphones, or extensive cabling lines.
Positioned firmly in the mid-fi realm, ADCOM defined accessible high-end audio for discerning buyers, blending value and performance that rivaled pricier competitors. After challenges and ownership shifts—including a Thai firm and a faltering 2010 relaunch—the brand staged a robust comeback in 2024 under J&B Distribution, reviving classics like the GFA-555ms alongside modern integrated amps and preamps, reclaiming its spot among savvy audiophiles seeking reliable, soul-stirring sound.
See all ADCOM listings on RADAR.
