Question about NAD Audio Players & Recorders

1 Answer

T773 hum on mains, not on center. Hum is independant of volume

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 624 Answers

I have repaired this problem a couple of times in NAD units and each time it was either a bad capacitor on the board that is vertical right between the power transformer and the heat sink. I can not remember the value of the capacitor, but it was near the middle of the board it is on and had the top of the cap pushed out a little. Or it was cold solder connections on an IC on the digital board. It has been over a year since I did these repairs, so I can not be any more specific due to failing memory. To sum it up for you, you will need to have it serviced by a qualified service technician to have it solved unless you have some very good electronic repair skills. I am sorry I could not be more help, but since this is a very good unit, it would be well worth getting repaired, it is not a cheap-o unit. I have been repairing audio equipment for over 18 years and have gotten pretty good at it, so I am sure the problem you have is not a real major problem, but it really does require some service from somebody who knows what they are doing. You should not let anybody touch it unless they are well qualified, it normally ends up costing even more money for a repair after an unqualified person tries to do repairs that they know nothing about. It is very easy to cause further damage that can be avoided with proper service. sorry i went on so much about this, but I really like the NAD you have and I honestly think you would be better served to take it in for repair.


Posted on Sep 06, 2008

1 Suggested Answer

  • 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

Sansui 7070 receiver Hum

Your filter capacitors in the power supply section are to blame and they need to be replaced.

Mar 30, 2014 | Sansui 221 Amplifier / Reciever

1 Answer

After only 5 minutes of turning it on, My Sony STRDH800 emits a loud hum, then the word "protect" is displayed on the screen, then it shuts off. The hum is very loud and you can't turn it down...

Are you sure that's what it is? Something is heating up for sure.

It could be protecting itself because something in the volume control is going bad and sending too much current through the amp or any other reason. In other words, you can guess and buy parts hoping to nail the symptom but not knowing the cause, or you could let a technician do it.

Mar 23, 2011 | Sony STR-DH800

1 Answer

Think I have it all connected correctly, but there is no sound

Hello Sir, Hi try to check the usual, like mute? or is the cable good? check the menu if the unit is on mute. or use another cable. you can check the unit by simply listening to the speakers soft HUM. this HUM should be present, the hum is most loudest at full volume (even if there's no music). A missing hum means two things, you have the speakers not connected or open (burnt). or you have problems with the unit. please check them both. let me know your progress.

Jan 17, 2011 | Pioneer VSX-D309 Receiver

1 Answer

I have no output from subwoofer

Hello Fixya customer,

Thank you for your question.

Please check that the sub woofer and RCA cable are working by removing the RCA wire from the Sub woofer output of the Onkyou and touching the center terminal of the RCA plug. You should here a hum when it is touched.

If you get the hum, then the next step is to "Clear" the Onkyo by holding down the "VCR and Stby" button until you see "Clear" on the display. Warning, this will clear any settings special that you have made to the receiver, but will get you back to the Factory settings.

Lastly, check various sound fields, and the Sub woofer volume setting, if you still do not get sound, please have a Onlyo service center verify the output.

Thank you using Fixya.

Apr 28, 2010 | Onkyo TX-SR606 Receiver

1 Answer

Only get sound out of right side both a and b

Good day sir, Hi, your Philips receiver trouble can be any of the ff:
  1. your receiver left fuse is blown, check if it has a user fuse at the back. or
  2. your main IC amplifier for the left channel is bad. you need to replace that IC, but check first the wiring of the speakers.
  3. Check your receiver left speakers if it is producing a soft hum, to do this turn down the right channel, or adjusting the balance knob to the left, or simply remove the speaker connection of the right channel. place your ears on the left speaker as you adjust the volume up and down, do you hear a soft hum that goes up and down also? If yes the problem is on the source section before main amplification, usually the pre-amplifier stage, If you hear no hum at all. problem with the main left amplifier. The main amplifier is usually a single IC for both left and right channel, OR one IC amplifier for the left and one for the right, in both cases, replace the bad IC.

Jan 21, 2010 | Philips Audio Players & Recorders

1 Answer

60 cycle hum at the same constant level, even if you turn the volume up all the way, it does not get any louder. What might that be caused from? A bad ground solider joint maybe? The Balance (L&R)...

If the volume control does not effect the hum volume, then the hum is being introduced directly to the final amp section. Check for defective caps in the power supply for the amp section. This will be the nigher voltage supply usually 40V or more.


Nov 04, 2009 | Teac AG-370 Receiver

1 Answer

Mains hum on Ferguson R121 DAB radio

wrap aluminum foil around the power cord

Jul 19, 2009 | Audio Players & Recorders

2 Answers

Pioneer Receiver SX-750: Getting a loud hum through the speakers

The hum you hear from the speakers and from the unit itself originate with 60hz AC power. They may not actually be related. Sometimes a transformer will hum slightly and unnoticeably. That you're getting a loud speaker hum says there is an electrical leak or a grounding issue somewhere.

Do all sources produce the hum or, say, just the phono? How about on headphones? Try rotating the AC plug. In those days they weren't keyed with one large blade as they are now.

May 17, 2009 | Pioneer Audio Players & Recorders

1 Answer

I have a Stanton T.80 and Vestax VMC-185XL mixer. I recently bought Rane Serato Scratch Live which requires the turntables to be grounded through the mixer...however, the turntable doesnt have a ground...

Hi gium

Sounds like we have reached that point where progressive crossover in technologies means that the usual cautions of earth continuity for the tone arm when using a phono preamp has gone the same way as phono preamps on home theatre.

Have you tried switching to the line level and set the mixer up for that level also. That may reduce any gain induced hum. However it sounds like an earth loop problem, where both decks will need to be earthed in the mixer. Check also that all the gear is running of the same power point. Different mains phases are sometimes available near each other, having any gear (power amps also) on a different phase will cause an earth loop problem.

Is the hum all the time independent of the volume levels, or change with levels adjustments and not at all when turned right down. Let me if changing to line levels helps. We can try some more things, like connecting a temp hookup wire earth to the RCA earth to mixer chassis. Cheers


Oct 04, 2008 | Audio Players & Recorders

1 Answer

On 1950s-60s twin valve amps in record players two questions how do you stop the loudish hum and how do you increase the volume. Thanks.

The hum is because of bad capacitors in the power supply area. Many of these have caps in the large silver cans. Replace them using standard electrolytic caps and the hum should go away. Once that is gone, the volume should return as well.


Aug 28, 2008 | Audio Players & Recorders

Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

367 people viewed this question

Ask a Question

Usually answered in minutes!

Top NAD Audio Players & Recorders Experts


Level 3 Expert

4678 Answers

The Knight
The Knight

Level 3 Expert

69795 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