20 Most Recent Adcom GFA-5802 2-Channel Amplifier Questions & Answers

Remove the output transistors and measure each of the sets of 3 pads and report the voltage readings here. I suspect that you have either a blown driver circuit or output transistors. The voltage readings will give me an idea on where to start looking for specifics.


Adcom GFA-5802... • Answered on Mar 18, 2016

Possibly. Most amps filter out line hum via low-pass filters. If you can locate a schematic, those would be the caps to check.

Adcom GFA-5802... • Answered on Jun 25, 2015

It should run hot to touch at idle, about 120F, because it is MOSFET type amplifier.

Adcom GFA-5802... • Answered on May 05, 2013

Sounds like it could be feedback hum. Is there anything near it that could cause a reaction when unpluged? Such as a turntable, cassette etc. If so move them and see if it goes away. Even then it won't hurt the amp. I think otherwise worry when there's a hum when they are plugged in. PS check any earth connections too!

Adcom GFA-5802... • Answered on Jun 23, 2010

Hi Allister...

Check for fuses and make sure that the speakers are solidly connected at both ends

I can suggest a repair place if needed

Adcom GFA-5802... • Answered on Apr 17, 2010

Flip Window Relay Fuse 29 Fog Lamp Relay Fuse 9 Fuel Pump Relay Fuse 19 Headlamp Relay Fuse 8 Heated Grid Relay Fuse 27 Horn Relay Fuse 5 Engine Fuse Module (Fuse 1) Fuse 24 Engine Fuse Module (Fuse 2) Fuse 16 Engine Fuse Module (Fuse 3) Fuse 6 Engine Fuse Module (Fuse 5) Fuse 6 This will help. Thanks please keep updated. please do rate the solution positively .thank you for using fixya.

Adcom GFA-5802... • Answered on Nov 23, 2009

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.

Adcom GFA-5802... • Answered on Nov 23, 2009

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

Adcom GFA-5802... • Answered on Mar 02, 2009

It sounds as if there is a broken solder joint somewhere that slowly opens up with heat. The other possibility is that an input or driver transistor is dying. Since the whole channel is dying, I would guess the broken joint and/or dying transistor are near the very input of the channel.
A tech can very easily find the spot by playing the amp until it starts to die, then spraying small bursts of freeze spray, one component or area at a time, until the amp suddenly comes back to life.

Adcom GFA-5802... • Answered on Sep 26, 2008


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

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