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Adcom GFA-5500

Stereo Power Amplifier

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Adcom GFA-5500


Power output: 200 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 20kHz

Total harmonic distortion: 0.02%

Damping factor: 700

Gain: 29 dB

Input sensitivity: 1.4V

Signal to noise ratio: 100dB

Dimensions: 178 x 432 x 349mm

Weight: 25.9kg



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Reviewed Jun 28th, 2018 by guest

I own a lot of hi fi gear (life long hobby). The GFA and big brother GFA 5802 are MosFet (HexFet) based solid state amplifiers designed by Nelson Pass. The 5500 and 5802 have a very smooth midrange and top end compared to many bi polar based amplifiers I've owned. Soundstage is wide and deep with good detail. The bass response of the GFA5500 is excellent and really couples well with my B&W 803s. The sonic signature of the GFA 5500 is pretty close to the 5802 with a few differences. The 5802 is a somewhat more transparent amplifier with a bit more authority compared to the 5500. My guess is most of the difference is related to the 5802 being biased much more in to class A operation. The GFA 5500 runs warm and can be mounted in a cabinet. The GFA 5802 runs pretty hot, with the heat sinks close to 125 degrees F.

Reviewed Jan 27th, 2016 by ClassicRock

Sounds Like Thunder , Running 2-15 Theater Monitors , thats 4 15's ! Greatest Amp I've Owned !



re: GFA-5500

Thank you so much for these manuals. I have had 2 amps from Europe for a very long time and asked several technicians about converting from 230VAC to 115VAC. The service manual outlines the process and was very clear and easy to download from your site.

Now, why couldn't the tech just have told me this? I have an idea, but I'll leave that and any criticism to others.

Again, my thanks for a great site.

Adcom GFA-5500

Thank you for the Adcom GFA-5500 Service Manual.
However this PDF appears to be missing pages 8 and 9, and according to the table of contents page 9 has the schematic. If someone has the complete manual it would be greatly appreciated.
Thank you.


Thanks for spotting that. The description has now been changed.

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