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ADCOM GFA555 MKII Power Amplifier For sale ADCOM GFA 555 MK II Stereo Power Amplifiers in good used condition. The Adcom GFA 555 MK II is a legendary power amplifier, and it has been fully serviced last year. A review : https://www.kenrockwell.com/audio/adcom/gfa-555-ii.htm Specifications: Power Output: 200W per channel (stereo), 600W (mono) into 8Ω Dimensions: Approximately 17" (W) x 5.5" (H) x 15" (D) Weight: Approximately 40 lbs Condition: Unit is in good cosmetic condition, with minor visible wear. Fully tested and operational. Pickup available in Mulgrave VIC (weekdays), Traralgon
This is a buyer’s market for this category at the moment, and at A$850 this sits a bit above the typical used cluster: the median is A$785, with the 75th percentile at A$817. So it’s not wildly out of line, but it is a touch ambitious rather than a clear bargain. If it were closer to A$785, I’d call it a straightforward fair buy; at A$850, I’d want the condition and originality to justify the extra.
That said, this is still a worthwhile amp if it’s clean and fully functional. Adcom power amps have a solid reputation for real drive, good current delivery, and a no-nonsense presentation that suits speakers that like grip and headroom. For a well-kept example, original ownership, servicing history, and intact cosmetics can make the premium easier to swallow. At this price, just make sure there’s no hint of scratchy controls, protection issues, or past repairs before jumping in.
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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