Question about Adcom GFA555 Amplifier

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I want to bridge 2 adcom GFA 555 amps to my sony DA7ES any suggestions

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Obviously you are going to use the Front pre-out's on the Sony to drive the Adcoms. its pretty straightforward, just do not use a speaker that is less than 8 ohms. and make sure that you always have the power switch off on the adcoms, let them sit off for 5 minutes, THEN hit the bridge switch on the back of the adcom's and follow their instructions for bridging. it's pretty easy and tough to go wrong. Good luck...Rob

Posted on May 30, 2015

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Posted on Jan 02, 2017

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SOURCE: 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.

Dan

Posted on Feb 11, 2009

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SOURCE: can you bridge an adcom GFA-5802 power amp?

Running an amp in bridge mode requires a specific circuit design. It is not possible to combine 2 amps in this fashion.
Dan

Posted on Mar 02, 2009

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SOURCE: how do i bridge an adcom gfa 5400

This amp is not designed to be bridged and can not be used in the mode you wish. Sorry, but internal circuit changes would be necesary for the amp to work as a single channel.

Dan

Posted on May 01, 2009

  • 1 Answer

SOURCE: Adcom GFA 555

Lakes Electronics, Inc.
5245 N. University Dr.
Lauderhill, FL 33351
United States
954-749-6100

These guys are listed as one of the 2 Adcom service centers in FL and should be your best bet.
Also Jason Schatten @ Electronic labs might be able to help. Electronic Laboratory, Inc.
1301 West Copans Road, A4
Pompano Beach, Florida 33064
Phone: (954) 969-2855
Fax: (954) 969-2879
Email: Jason@ElectronicLaboratory.com


Hope this helps. Parag

Posted on May 10, 2009

Grubhead
  • 5151 Answers

SOURCE: adcom gfa 555 blows the 10 amp fuse and the 6 amp

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.

Posted on Oct 19, 2009

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How do you connect wiring to bridge an adcom gfa 5300?


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http://www.audioreview.com/cat/amplification/amplifiers/adcom/gfa-5300/prd_116265_1583crx.aspx

"Weaknesses:
Not bridgable."

Generally an amp that IS bridgeable uses the positive speaker terminals and some switching method to tell the unit to run as bridged. This is NOT a recommendation to try it on the 5300.

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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.

Jul 11, 2010 | Audio Players & Recorders

1 Answer

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.

Oct 19, 2009 | Adcom GFA-5500 2-Channel Amplifier

1 Answer

How do i bridge an adcom gfa 5400


This amp is not designed to be bridged and can not be used in the mode you wish. Sorry, but internal circuit changes would be necesary for the amp to work as a single channel.

Dan

May 01, 2009 | Adcom GFA-5400 2-Channel Amplifier

1 Answer

Can you bridge an adcom GFA-5802 power amp?


Running an amp in bridge mode requires a specific circuit design. It is not possible to combine 2 amps in this fashion.
Dan

Mar 02, 2009 | Adcom GFA-5802 2-Channel Amplifier

1 Answer

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.

Dan

Feb 11, 2009 | Adcom GFA-5400 2-Channel Amplifier

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