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My adcom gfa 555 produces out of only one channel now

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Swap the RCA's on the back left to right and right to left. If the same speaker is not playing, the problem is in the amp. If the problem migrates to the other channel, check your connection at the source and try another source directly hooked up to the amp. If you still have a channel out, pop the top of the amp and check for a channel fuse. some have them some don't. It depends on the generation of the amp, some just use capacitors and transistors which would require a trip to the service center. Great amp! not much on the radar as a troubled piece of electronics!. Also, swap speaker outputs as well to rule out a bad speaker. Hope this helps

Posted on Nov 20, 2009

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Can anyone tell me if the Adcom 5503 three channel amp is common ground? I want to use it to power some old school polk SDA 1C as my mains and a CSi5 polk center. Thanks


no reason why not, 3 channel amps used to be the "state of the art" back in the early stereo days. the third channel was produced from the sum of the right and left channels, (the plus side of the right and the plus side of the left were sent to the center channel. produced what was considered at the time a true reproduction of the sound as it was intended to be. your lucky to have this old amp.

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On the inside back wall of the 1986 Adcom GFA-555 Stereo Power Amplifier there are four fuses,two for each channel. Would you tell me please, what amp fuse they are and if they are the fast or slo-blow...


Sorry to contact you this way but i've spoken to an older colleague of mine and it appears that before 1992 in the Adcom GFA-555 they were using bipolar transistors and the amp was rated fo a minimal impedance of 4 ohms - not like in the newer ones that have MOSFETs and are rated for 1 ohm in bridge mode. So the fast fuses that you need are of 6 amps , not 20 like in the newer models.
Sorry for my mistake.

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1 Answer

Adcom GFA-7400 power amp; 1 dead channel (thermal protect LED on)


Hi...

I've contacted ADCOM before and they sent a pdf of the electricals

http://www.adcom.com/default.aspx

also try:

www.stereomanuals.com

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I turn on the ADCOM GFA-5802 amplifier... ...The power light comes on, but does not heat up nor output sound


Have it serviced. Do you know what GFA stands for. People at Adcom do have a great sense of humor. Take it only to a high end audio servicer. Contact Adcom. This is good stuff you wouldn't want a hack working on it.

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Adcom gfa 555 blows the 10 amp fuse and the 6 amp fuse on the far right


Any fuse blowing is caused by a shorted component in either the power supply section or main audio amp part. Follow the fuse circuit and see where it leads you. Look around for burnt of damaged parts. Suspect anything sitting on a heat sink. The most common culprit is the audio amp main transistors, especially if someone shorted the speaker leads together. In the power part it could be the transformer, the large Electrolytic capacitors, rectifier, or voltage regulator. Some amps use an IC for amplification and this can blow the fuse.

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How to bridge GPA 555 adcom amp from 8 om to 4 om


First of all, when bridging an anp, the impenence that it can handle usually goes UP not down. I don't believe that the GPA555 can be bridged without circuit modification.

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Adcom input jack replacement


The input jacks on a 555 are a standard gold plated, high quality jack. looking around the net, you should pay no more than 7-10 dollars each ( or just get originals from Adcom. ). What is your comfort level with electronics?. Can you solder properly?. I cant answer this without more info.....thanks...Good luck...Rob

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