RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.
At US$345, this used Adcom GTP-500 preamp is ambitious compared to the typical market, sitting well above the median of US$299 and exceeding the 75th percentile of US$311 from your 16 comparable listings. While a professionally serviced unit at Vintage Audio Exchange is asking US$325, the US$345 price here lacks a clear value edge unless the condition is exceptional or accessories are included, making it a tougher buy than the fair-market options clustering between US$250 and US$311.
The GTP-500 remains a well-regarded vintage preamp for its capacitor-free signal path, excellent tone controls, and built-in FM tuner, offering genuine high-performance value for stereo music. If this listing includes the original remote and shows no tone-control clicks or pops (a known issue on some units), it could still be a worthwhile find for a collector seeking a clean, original-owner example, but the price demands confidence in its condition and completeness to justify stepping over the median.
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.
