Question about Adcom GTP-760 Amplifier

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No output in Right channel on my Adcom preamp GTP-450

I have tried evrthing but I'm not getting output out of my right channel from this preamp. This happened suddenling after years of use

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  • pughmurals Feb 25, 2009

    I did try that, it transfers the problem. I ended up buying a new reciever with a pre out and now the Adcom amp works fine. I gave up on the Adcom pre amp. Thanks for responding

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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

Posted on Feb 25, 2009

  • Scott Frye
    Scott Frye Feb 25, 2009

    If youre thinking of dumping the pre-amp
    Let me know.
    Thanks


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2 Answers

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.

Feb 08, 2014 | Adcom GTP-870HD 7.1-Channel Amplifier

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GTP-870HD . I2C ERROR ;


check ebcelectronics.com they have flt rate service for that model.

May 12, 2012 | Adcom GTP-870HD 7.1-Channel Amplifier

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Adcom 5300 thermal protection light is on right side all fuses are good


Is it actually getting hot? If so, make sure it's getting the required ventilation and that you're not over-driving it. Page 5...

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Adcom-GFA-5300-Car-Amplifiers-manual/id/582ci558/t/2/

Apr 03, 2011 | Adcom GFA-5300 2-Channel Amplifier

1 Answer

My Adcom GTP 760 Preamp/Processor produces a hum that is affected by the volume control. I think it must be a bad capacitor in the power supply but would like your opinion. I do not have a tech manual...


This is not likely a power supply problem, but is isolated before the pre-amp stage. This can be a defective IC in the preamp stage as well.

Adcom schematics are not generally available, but you may be able to isolate the problem with a little experimentation. Try to run a signal through to see if you can get the signal as well.

Please update this with your results.

Thanks,
Dan

Aug 17, 2010 | Adcom GTP-760 Amplifier

1 Answer

Recently, after about an hour of play, when my Adcom GTP-760 is warm, a low level hum begins and can be heard on all channels regardles of the source selected. The hum cannot be heard when the unit is...


The filter capacitors are probably going bad is the likely cause.

It may also be bypass capacitor in the preamp section.

Noting whether the hum volume varies with the setting of the volume control would aid troubleshooters.

One might be able to isolate the bad component with freeze mist/circuit cooler.

Apr 21, 2010 | Adcom GTP-760 Amplifier

1 Answer

Adcom GFA-7400 power amp; 1 dead channel (thermal protect LED on)


Hi...

I've contacted ADCOM before and they sent a pdf of the electricals

http://www.adcom.com/default.aspx

also try:

www.stereomanuals.com

Mar 30, 2010 | Adcom GFA-7400 5-Channel Amplifier

2 Answers

Checked both speakers..no matter which i connect to right output speaker terminal.get static.speakers r fine. system is ten years old.


Right output transistor is fried, replace . Take old ones (both left and right) to radio shack for new replacements.Replace BOTH

Dec 07, 2009 | Adcom GFA-5300 2-Channel Amplifier

1 Answer

Adcom 7500, Adcom 5400(bi-amp), Marantz AV-9000, Dakiom HA103


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

Mar 25, 2009 | Adcom GFA-7500 5-Channel Amplifier

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Best amplifier for bose 901 VI speakers


By all-in-one amplifier that handles the surround I think you mean all-in-one receiver or preamp. Amps are just big dumb muscular power supplies for speakers.

The source control and digital decoding could be handled by a modern AV receiver with multichannel analog outputs for driving separate amps or you could get a digital AV preamplifier/control unit functionally like this Adcom. Prepare for sticker shock.

http://hdtvdreams.com/Adcom-GTP-870HD-7.1-Multi-Channel-Processor/Preamplifier-GTP870HD.aspx

Understand that EACH PAIR of Bose 901's will require its own DEDICATED two channels of amplification AND someplace to jack in its Active Equalizer - between the line level source and the power amp.

Conventional speakers can probably run off the receiver's amplifiers since they don't/can't/must not have the Bose Active EQ in line with them.

Having a single pair of 901's plus a passive subwoofer or two in the same room for accurate 6- or 7.1 surround would require at least four stereo amps or some combination that adds up to 8 channels.

In my own system I have a Pioneer VSX-36TX Receiver (with 5 potential channels of amplification for Left, Right, Center, two Surrounds) doing light duty as the control and routing center but ONLY driving the Center (two Kenwood 777's) and Surround speakers (Bose 301's). I have a Carver 5-channel amp pushing the Bose 901 Front speakers (100Wx2), two dbx Subwoofers (110Wx1) and the Bose 301 Rear Surround speakers (60Wx1).

You could probably get by with a powerful 2-, 3- or 4-channel amplifier to push the 901's and subwoofer(s) as I did. It's the cheapest way out if you get a decent AV receiver. Once you set up the levels and delays the receiver does all the thinking and controlling for you.

Mar 18, 2009 | Bose 901 VI Main / Stereo Speaker

1 Answer

No remote found


If pushing the power button does nothing, the unit is probably in "protect mode". This means there is an internal problem and will require professional service.

Sep 08, 2007 | Adcom GTP-760 Amplifier

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