Adcom Repair: Adcom GFA-565 Repair Service

The Repair Service covers ANY repair of the Adcom GFA-565 power amplifier.

GFA-565s are one of the best power amplifiers, but over the years most of them have to be repaired because of the known problem with leaky electrolytic capacitors.

Bad capacitor

Corroded board

Huge corrosion

The problem:

There are few bad electrolytic capacitors on the input board. The electrolyte from bad caps spills over the board. The electrolyte is a conductive liquid which causes servo DC and differential circuits to malfunction. At this point the amplifier can not properly control DC voltage at the speaker output terminals, which has to be about 0 volts without input signal. As a result you notice that the amplifier make loud turn on/off pop or has distorted sound.
On the other hand, the electrolyte is corrosive liquid which can cause damages of some parts on the board.
As a consequence, the amplifier gets dangerous voltage at the speaker terminals, up to 70 volts, which can destroy the speaker.

This process is very slow and can take several months before the amp blows the speaker, so you have a chance to notice this problem and save your lovely speaker.

Diagnosing:

Simply check DC voltage across the speaker terminals without input signal applied by using a multimeter.
When you turn on the amp, the DC can jump up to 0.2 volts, then it slowly goes down. In 1 minute it must be stabilized at 0-30 mV (less than 0.03 volts).
If your amp has more than 30mV DC, it must be repaired ASAP.

We have extensive experience with this model and know all problems of the unit. We will fix current problem and upgrade all known-as-faulty-parts.

Typical symptoms of bad amp:

Loud pop when you turn on/off the amp
Sound distortion when amp is cold
Overheating
Fish smell form the amp

Does your amplifier have one of these symptoms? If so, service it ASAP before you get one of the following symptoms:

Distortion LED or thermal protection LED is on, no sound
Fuses are OK, but no power
The amp blows the fuses or speaker

We have worked with this model for long time, since the first problems occured. We have extensive experience in repairing this kind of problems. We have used different methods of cleaning the preamp board and have found the best solution. Your amp will be 100% fixed. There are no amps which can not be repaired.
We take good care about your amp, we use special things to protect your amp from any scratches during the repair.
The service includes a repair of both channels of the amplifier. Even the second channel is ok both preamplifier boards must be repaired.
We use high quality components to prevent future problems. All known as weak or nonstable components also will be replaced.
We provide 90 days warranty. Turn around time is 5 business days.

Repair Service Price = $190

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Additional options

If you would like you can add some extra options to the repair service

$90		Dayton binding posts installation Replace regular binding posts with Dayton BPP-G Premium Binding Post Pair Gold. There are 2 pair of posts per amplifier These high-quality 5-way binding posts offer audiophile features at a reasonable price. A free-spinning metal ferrule on the tightening knob allows the secure connection without any tendency to work loose. The posts accept up to 4 AWG (5.5 mm) speaker wire.
$60		IEC Power Socket Installation This IEC power jack is perfect for replacement, so the amplifier can be used with IEC style detachable power cord. It is constructed out of high temperature, impact resistant UL94V-0 plastic. The heavy gauge contacts are made of nickel plated brass. Contact rating: 15A, 250VAC. UL and CSA listed.
$50		Adcom binding posts installation 7awg (3.7 mm) binging posts like in late Adcom GFA amps. 2 pair of posts per amplifier.
$120		Speaker protection circuit installation Protect your speakers by this module with 30 amp relay. Function: This module connects the speakers in 10 seconds after turning on the amp if no DC is presented at the output of the amplifier. immediately turns off the speaker if any DC is detected or the amp is turned off Eliminates turn on/off pops 30 amps relay, low resistance

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Return shipping = $50

Total = $240

Note: You are ordering not an item but repair service. You will need to ship your unit to us.