Question about Adcom GFP-710 2-Channel Amplifier

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I have a problem with the Main Output on my Adcom 710 Preamp

I have a problem with the Main Output only, were the left speaker drops out. If I increase the volume it will come back on again, but it usualy drops out again after an intermittant time period. I tmay work for two days without a problem at a time. There is no problem with the Bypass Output.

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Hi am gathering that when it is bypassed (tone) its fine which suggests that the problem is on the treble/bass pots or boards. Try cleaning all the pots with switch cleaner first (open the amp and spray it into the pots them selves through little holes). If not there then Check for a loose wire, and can also tap the boards with back of screwdriver while the amp is playing to listen for dry joints (loose solder and CAUTION for getting a shock also!!)
Pretty sure though on the pots or dry joints.

Best of luck

Posted on Jul 25, 2009

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Posted on Jan 02, 2017

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Use "Main Out Norm" from the gfp-555 pre-amp and connect to Canon connectors of the Yamaha. This requires a standard RCA to Canon cable for correct connection. Start with this first, if that works OK than try the "Lab" output of your pre-amp, but I am not sure if the Yamaha can handle this or the results of sound quality. Your choice.

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How do I eliminate buzz?


Things to check:
1. With your multi meter, measure from left ground to right ground. What do you get? Measure from each input ground to chassis. What do you get there.

2. Get or make a pair of shorting plugs. Plug those into the inputs. Power on. Hum there or gone?

3. Turn the pre-amp on. Connect. Level of hum change with preamp on?

4 additional information. How efficient are your speakers? This is a big amp, high-efficiency speakers may show some noise, while low-efficiency speakers won't.

A trip back to the shop may be indicated, too.

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Preamp intermittent channel


Getting the connections right is a problem. One thing I find helps is the THX DVD discs that certain movies have on them. They have a sound set up to get it right. It makes a tone for each channel so you can hear which channel is working. It should help you set up the system right and determine if any channel has a fault on it.

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Can I run two stereo amps from same preamp?


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Help! My Adcom 555 amp and Adcom preamp is making a buzzing noise in one speaker - any ideas on troubleshooting - is it the preamp or amp?


Try a different audio source.

Disconnect the cable at the preamp end from the amp and see if it stops.

If it does = preamp.

If not = cable or amp.

Reseat cables at both ends with a twisting motion.

Swap left to right.

There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.


Turn the volume to something reasonable and see if that helped.

Lots of ways to eliminate sources of the fault and isolate the problem.

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1 Answer

I have a ADCOM GFP-710 Stereo preamplifier when I turn in on, it will only stay on for 1 second. That's it. Any ideas? Thanks, fred.


Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.


Check for loose speaker connections as a root cause for intermittent shutdown.

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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

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Hi...
Have you tried swapping speakers to see if the trouble moves to the other speaker?
It could be a dirty selector switch .

It could be a broken solder contact on the input or output RCA jacks

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