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This Adcom is in very good condition on the inside and good condition on the outside. This has been thouroughly serviced, all three power boards have been recapped, New power switch. Sounds and looks GREAT. A few small age related scratches.The Adcom GFA-5503 is a highly regarded 3-channel audiophile power amplifier, famous for utilizing MOSFET output stages to deliver tube-like warmth and smoothness. It provides high-current, dynamic power perfectly suited for demanding home theater front stages or active bi-amping.Core SpecificationsPower Output: 200 W per channel into 8 ohms; 350 W per channel into 4 ohmsChannels: 3 fully independent channels, each with its own power supplyCircuitry: Precision-matched MOSFET devices throughout the signal pathCapacitance: 120,000μF of power-supply filter capacitance for massive reserve capacityTransformer: Custom toroidal power transformer for high peak-current capabilityWeight & Dimensions: 57 lbs (25.8 kg); 7" × 17" × 16"
At US$1,199, this Adcom GFA-5503 is priced right at the median of the typical used market, making it a fair deal rather than a bargain, especially when compared to newer budget multi-channel amps that often lack its raw power and build quality. The GROUND TRUTH data from recent comparable listings confirms US$1,199 as the median, 25th, and 75th percentile, so the asking price is neither ambitious nor discounted.
This amplifier is well-regarded for delivering 200 watts per channel into 8 ohms with exceptional detail and dynamic headroom, ideal for home theater setups requiring clean, high-power performance. Its robust construction and THX compatibility add meaningful upside for enthusiasts seeking original-owner condition gear without the need for immediate re-capping. While it runs hot and lacks a 12V trigger, these are known trade-offs for its power density, and at a fair price, this listing represents a solid buying opportunity for a proven, high-performance unit.
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.
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