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This is a fair ask, right on the typical market for this piece. With 17 recent comps, US$175 lands exactly at the median, below the US$249 75th percentile and above the US$150 25th percentile, so it reads as solidly reasonable rather than a steal or an ambitious ask.
What makes it worthwhile is the GTP-400’s reputation as a lively, well-regarded vintage tuner/preamplifier with a competent MM phono stage and the punchy, dynamic Adcom sound people still chase. At this price, a clean unit that powers up properly, switches quietly, and has a healthy tuner section is worth a look; the main thing to confirm is normal age-related function, since tuner sections and controls can be the weak spots on old gear.
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.
