Question about NAD T751 Receiver

2 Answers

NAD T751 constant buzz

Dear audio experts,

I have a NAD T751 Sound Receiver with a constant buzz on the background. The buzz has always the same loudness, so when I play my songs hard enough I do not hear it, but when I lower the volume or between songs it is very annoying. I’ve also tried different cables and CD players, but the receiver turns out to really cause the problem.

Is this a known problem for the T751 and how can it be solved?

Please let me know if I need to give additional information.

Thanks in advance,

Tim van Schie

Posted by on

2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 10 Answers

It is a known problem with this model. The source of the buzz is the Dsp power supply. On the DSP board itself there is a 2200my\f/16v capacitor that is defective . Usually the capacitor will turn brown and swells due to overheating. Replace it with a higher temp rating capacitor with the same capacitance and voltage specifications.

Posted on Aug 10, 2010

  • 1 more comment 
  • Kasper Mikkelsen Jan 27, 2011

    Reference to position number would be really helpfull.

  • Kasper Mikkelsen Jan 27, 2011

    Position number would be greatly appreciated. Also I would like to know if the US models are earthed through the main plug - EU version isn't.

  • dldaniel Feb 21, 2011

    I am having a problem with NAD T751 whereby when EARS or Pro logic mode is used for a 2 channel mode, after a few seconds all that is heard is loud noise The sound is fine in stereo mode and the 5.1 input seems also to be fine. The problem is not consistent and sometimes the unit turns itself off.
    Do you think this involves the same faulty capacitor on the dsp board?
    If so can anybody shed any light of where the faulty capacitor can be found?
    Many thanks!


  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 31 Answers

Do you have Cable TV, or a Cable TV box plugged into the unit? If so, it may need an isolation transformer on the line (cable), due to the TV cable and the power using different grounds.
These should be commonly available anywhere any type of AV equipment is sold.

Posted on Sep 26, 2008

  • facada Oct 22, 2011

    the problem is in 12 0 -12V power supply you need to change all capacitatores and upgrade the termal decipator.
    if you need more information send me email to


4 Suggested Answers

  • 1 Answer

SOURCE: Receiver humming momentarily when turned on

i have solved thsi problem. The reseller suggested that probably a earthconnection was demaged and indeed that was the problem. by heating the earthconnections, specially the wired ones this problem disappeared.

Posted on Feb 02, 2008


To reset the the T743 hold down the video 6 and the source up buttons for 3 seconds. then power up from the back button

Posted on Sep 13, 2008

  • 1 Answer

SOURCE: NAD 7130 FM stereo signal (on off again and again)

The contacts in the A B speaker selector switch had degraded on my NAD 7130 receiver. Distortion and signal loss would come and go. Contact cleaner and wriggling the swx knob became useless. Then, years ago I jumped the swx with small lengths of bare wire and tinned the whole thing with solder. Never had a problem since and it probably improved the receiver because it eliminated a component in the output stage that could (and did) introduce distortion.

Posted on May 26, 2009

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do i fix the buzzing on my nad t741 5.1 receiver?

Bad screening on your cables.
Braided cable coax touching signal cable
Wires in close proximity to power wires
Interference from 'always on' appliances like fridges, freezers and heating boilers.

Disconnect each lead in turn. If that doesn't fix it, it is an appliance.

Apr 16, 2016 | NAD Audio Players & Recorders

1 Answer

Power transformer over heating

Transformers will get hot if you are running the receiver hard. Most transformers have a built-in thermal fuse. If this fuse goes, then you have to replace the transformer. Just make sure you have good ventilation around the unit. don't have anything on top that might block airflow

May 19, 2013 | NAD T751 Receiver

1 Answer

Hi, nad going but no sound from speakers. can get FM but only up towards full volume.

Checker speaker wiring on back for shorts, if okay! the audio drivers and outputs are highly suspect, at this point I suggest a serviceman because of the complexity of the surround sound system.

Apr 20, 2012 | NAD T751 Receiver

1 Answer

NAD T751 shuts down

There is a board between the front and the main transformer. It's connected to the front with a wide flat kable. There are some capasitors like C173, C174, C176 and C199 that usally dry out. There is also on capasitor on a small additional circuit on this board. This was the main problem in my case. It's 2,2uF/50V.

Dec 15, 2011 | NAD T751 Receiver

1 Answer

I am trying to hook up my home theater system

With the NAD model that you have and its lack of component or HMDI switching, the only way is to connect your system, sort of, backwards.

The only way to do it is to connect your digital cable box and blueray player directly to the tv, then the audio output from the tv to one of the video inputs on the NAD. The NAD has digital coaxial and toslink inputs so if your tv has one of them as an output, that would give you the best sound to the NAD. If your tv does not have either of those outputs, then you will be limited to the composite outputs (red and white) but that will still give you good sound.

Also, depending on the digital output to input configuration, you could possible find a converter online.


Jan 19, 2010 | NAD T751 Receiver

1 Answer

My front display is burnt out on my NAD T751. How do I fix this?

Usually the problem is not that the display is burnt out but the voltage that supplies the filament is missing due to bad solder contacts on the terminals of the display.
If you disassemble the unit so you can see where the display assembly solders into the board check/resolder those terminals.

Oct 19, 2009 | NAD T751 Receiver

1 Answer

Is there a reset button for the NAD Surround Sound Receiver T 751

The only reset that i know of is to unplug it for 15 to 20 minutes. Hope this helps.

Dec 03, 2008 | NAD T751 Receiver

1 Answer

OSD and Volume bar on TV jumps..

Acording to the service manual - pressing "MEMORY" and "VIDEO 1" toggles between PAL and NTSC

May 02, 2008 | NAD T751 Receiver

3 Answers

Buzz or hum

My guess would be +and -12v supply to preamp opamps has ripple. (drycaps or bad solder). I may be able to get you a pdf service manual if needed.

Jan 27, 2008 | Denon AVR-3300 Receiver

Not finding what you are looking for?
NAD T751 Receiver Logo

810 people viewed this question

Ask a Question

Usually answered in minutes!

Top NAD Audio Players & Recorders Experts


Level 3 Expert

4852 Answers

The Knight
The Knight

Level 3 Expert

72620 Answers


Level 1 Expert

2 Answers

Are you a NAD Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides