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

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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.

Dave

Posted on Sep 06, 2008

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

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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.

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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.

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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.

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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.

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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.

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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

regards
robotek

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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.

Dan

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