RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.
US$299 is a fair ask, sitting above the US$250 median but still well below the US$345 75th percentile, so it reads as reasonable rather than a bargain. It’s not a steal on the numbers alone, but it’s also not overpriced for a used piece that may be harder to find in clean, working shape.
The GTP-500 is worth a look because Adcom’s preamps are generally respected for straightforward, solid analog performance and an easy, listenable presentation. For a buyer, the upside is mainly in finding one that’s been kept original and functions quietly: check all inputs, the volume and selector controls, and whether any tape/processor loops are included and working. At this price, a clean, fully operational unit is the kind of listing that can make sense for a system build.
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.
