Adcom GFA-565 Monoblock Solid State Amplifiers With Original Boxes - Like New


This is a rare find, a pair of legendary Adcom GFA-565 amplifiers like new in their original boxes, complete with all packing materials and owner's manual. 

We had a hard time determining whether these are NOS (new old stock) or just very well cared for.  There is some evidence they were taken out of their boxes and connected at some point, so we are listing them as mint in their original boxes. 

The GFA-565 was quite the amp in the 90's, and the the successor to the top selling GFA-555 stereo amplifier.  It produced 300W and cost half as much as the nearest competitor, hence the great selling record. 

While they are super powerful, they come in a fairly compact and lightweight package, making them easy for a single person to move around and put in place. 

While the Adcom company we knew and loved is no longer in business, prices on the top models seem to be going up as audiophiles on a budget rediscover the brand.  They are simple in design and use common parts, so servicing them if the need arrises should be an easy task performed by just about any technician. 

We tested these monsters on our new test rig which maxes out at 250W.  The Adcoms stayed cool, working effortlessly, without any signs of strain or noise.  While we did not get to 300+ watts on our test rig, we are confident they are in perfect working condition. 

Solid-state monoblock power amplifier

Rated power output: 300W into 8 ohms (24.8dBW), 450W into 4 ohms (23.5dBW), 850W into 2 ohms (23.3dBW), all 20Hz–20kHz at 0.02% THD
Frequency response: unspecified
Input impedance: 50k ohms
Input sensitivity: 2.15V for rated output
S/N (A-weighted, full output): greater than 106dB
Damping factor: >1000, 8 ohms, 20Hz–20kHz
Dynamic headroom (at 4 ohms): 1.6dB.
Dimensions: 17" W by 8.25" H by 11.5" D
Weight (shipping): 45 lbs. 

Manufacturer: Adcom, East Brunswick, NJ 08816 (1991); Adcom, LLC, PO Box 2668, Sedona, AZ 86339. Tel: (602) 773-1909. Fax: (928) 239-9378. Web: (2009).

Click here for a PDF copy of the to User Manual



Original Box







Yes - Power

Physical Condition


Working Condition


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