Question about Adcom GTP-870HD 7.1-Channel Amplifier

2 Answers

Preamp intermittent channel

I am puzzled. i have a adcom gtp-870hd, i love the preamp, but when i run the 7.1 channel, only the front and the back and center will show sound. what is my options? sometimes while playing music at 7.1 all channels play except on side channel or speaker has no sound but the other side of left speaker sounds great, i switched cables then the right speaker has no sound. then i tried to switch the cables from a different, like the main to switch to side and side to the main then no sound of main speakers which are the side speakers but the side as main works great. i need support.. thx just tech just more complicated as future moves foward... thx need help?

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2 Answers

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  • Adcom Master
  • 5,017 Answers

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.

Posted on Mar 11, 2014

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  • Adcom Master
  • 924 Answers

As all units made within the last 5 years. or so, use non-leaded solder, you can have cold solder connections(bad solder connections) causing intermittent output from any and all channels. I would seriously doubt any capacitors are bad, as if they were, that channel that is bad, wouldn't come back on. It would stay off until it's fixed. If you need more assistance, or would like to inquire about repairing your unit, please visit my website, audioserviceclinic.com. You may contact me there.

Posted on Dec 13, 2014

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Posted on Jan 02, 2017

petraman7
  • 1175 Answers

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

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

petraman7
  • 1175 Answers

SOURCE: 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

Posted on Mar 25, 2009

o2bucfree
  • 7 Answers

SOURCE: ADCOM GFA7500 problem

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.

Posted on Feb 22, 2009

  • 2 Answers

SOURCE: Adcom GFA 7500 problems

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.

Posted on Aug 29, 2012

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

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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)

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Hello, My ADCOM GTP-870 HD has recently started cutting signal randomly. I'll watching a movie and all of a sudden I hear a click, and no sound or picture and the front panel had no lights . The power...


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 or marginally low impedance loading by the speakers; 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 and competent hands-on tech.


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

Feb 27, 2011 | Adcom GTP-870HD 7.1-Channel Amplifier

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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

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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

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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

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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.

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1 Answer

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


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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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.

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