20 Most Recent Adcom GFA-7500 5-Channel Amplifier Questions & Answers


Are your grounds to BARE metal sounds like a ground loop issue.

Adcom GFA-7500... • Answered on Apr 16, 2013


My right channel went out on my GFA 7500 and the problem was TWO blown internal fuses. Each amplifier inside the GFA 7500 has two fuses. In order to get to the fuses you must first take the top of the amplifier off by removing the screws using an allen wrench. Then put the top back on.Turn the amplifier over and remove most of the screws from the bottom to access the fuses in the bottom of the amplifier. There are two different size allen wrenches on the bottom. Be careful to not drop a screw inside the amp and make sure you line up the screw holes that hold the amps using a small screw driver to push the amps into position. I replaced all the fuses on the top and the bottom. AdCom sells the fuses on their site.

Adcom GFA-7500... • Answered on Aug 29, 2012


Good gift. It is a 5 channel power amplifier and I do not recommend to connect any sources directly to it. Now you need to buy a preamplifier/ receiver from Adcom GTP series or other brand to connect you dvd player, cd player, cable box, playstation etc. you need 5 good speakers to get your surround sound (or 2 for stereo)

Adcom GFA-7500... • Answered on Jan 01, 2012


no this AMP is not bridgable to get more power out of this amp you need 4 ohm speakers.

Power rating
1 - 150 watts into 8 ohm speakers
1 - 225 watts into 4 ohm speakers

Adcom GFA-7500... • Answered on Feb 23, 2011


suggest both channels have gone d.c.

Adcom GFA-7500... • Answered on Feb 08, 2010


I don't have experience with the 7500 but I had a 7000 with multiple bad channels (red light lit). The problem was bad filter capacitors on the amplifier boards. The large black filter caps (two per channel) were leaking on every amp board. Its a relatively easy repair if you can solder.

FYI you'll probably need a set of small hex head drivers to open the unit.

Adcom GFA-7500... • Answered on May 05, 2009


Try just the power amp on ..nothing connected
no Dakiom thingy either. It's a matter of elimination. Start at the output device and work back. Keep the Dakiom out of the loop.
If there's hum with just the Adcom..then it's the ADCOM

Adcom GFA-7500... • Answered on Mar 25, 2009


https://www.diyaudio.com/forums/solid-state/236765-adcom-gfa-555-ii-blowing-main-line-fuse-ideas.html

Adcom Audio... • Answered on Apr 03, 2020


Hello Curtis, comment that teams accompany the Adcom, to know where the signal arrives at the entrances of the GFA6000, I ask you this, to make a map of your sound system and try to find the possible place of failure Try the left and right speakers, in the outputs that work, it can be the Surround, to check that they are working I await your comment Greetings Franco Dosil Hola Curtis, comenta que equipos acompa?an al Adcom, para saber de donde llega la se?al a las entradas del GFA6000, te pido esto, para hacer un mapa de tu sistema de sonido y tratar de encontrar el posible lugar de falla Prueba los parlantes izquierdo y derecho, en las salidas que funcionen, puede ser las de Surround, para comprobar que est?n funcionando Espero tu comentario Saludos Franco Dosil

Adcom Audio... • Answered on May 13, 2019


Your laser mechanism has lost its ability to focus on the surface of the disk and can no longer read the data. Needs to be replaced since repair not cost effective.

Adcom Audio... • Answered on Jul 05, 2017


Check and download from service manual.com the operation manual.

Adcom Audio... • Answered on Nov 01, 2016


If I can read you right you are saying that the device keeps blowing the fuse? Fuses blow when there is an overload. As it is an amplifier we are dealing with the cause is more than likely a shorted output transistor or more than one, or whatever does the main amplification for the device. These devices are located on the main power amp board attached to a heat sink. If the amp has fuses for each channel then you only need to replace the devices on that channel, with the fuses blowing on it. The cause of shorted devices is often bad speaker wires or them touching.

Adcom Audio... • Answered on Nov 22, 2015


No Power means no supply. Step by step troubleshooting is recommended. Start with the main source power,then the cable wires,then to the primary section of the circuit board.Some components may be busted already.

Adcom Audio... • Answered on Jan 07, 2015

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