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Preamp has been fully tested across all channels and sounds superb. Would work amazingly well with a matching ADCOM power amplifier. Has some slight cosmetic scratches and marks on outside of unit from use, but otherwise looks exceptional. Includes remote.
The timing is fine here only if this is a late-model classic you specifically want, because the GTP-602 is from an earlier generation of ADCOM preamps rather than a current reference piece. At US$350, it lands above the US$263 median for comparable recent listings and just under the US$375 75th percentile, so it reads as fair-to-slightly-strong, not a steal.
What makes it appealing is the combo of tested working, sounds great, and remote included—that’s exactly the sort of complete, ready-to-use package that saves hassle on a vintage preamp. ADCOM gear has a solid rep for clean, punchy, straightforward performance, so if your system needs a no-nonsense control center, this is a sensible buy. I’d mainly want confirmation that all inputs, controls, and the remote behave properly, since that’s where vintage value lives.
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.
