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Up for sale is a audiophile bi-amped system which includes:One Adcom model GFP-715 pre-amplifierThree Adcom model GFA-555amplifiersFour B&W speakers model Matrix1 made in EnglandTwo low-bass modules Dahlquist model DQ-1WThe power button in one of the GFA-555 unit is stuck. The unit automatically turns on with you plug the power cable. Doesn’t affect the functionality of the unit.The pre-amp (model GFP-715) has a glitch and disconnect the audio input source. I’m not an electronic technician but suspect is a bad capacitor somewhere in the circuit. Should be easy fix.The package includes the stand (made at home) all the cables I can give you. I will also include a Panamax MAX 4300-EX, a 15-amp power conditioner with no cost.
The used ADCOM GFA-555 stereo power amp market sits firmly in the USD400-800 range lately, with a median asking price of USD449 across three recent comparable listings (25th percentile USD424, 75th USD775). At USD1,100 with unknown condition, this one's ambitiously priced—more than double the median—unless it's pristine, recently serviced, or includes rare upgrades that justify the premium.
Before biting, insist on a full power-on test: both channels clean with no hum, buzz, crackling, or overheating, as these old beasts suffer output transistor failures and capacitor woes from age. Verify service history, cosmetic state via detailed photos, and any included manual or power cord—missing bits should knock the price way down.
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.
