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
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
Audio Players & Recorders - NAD - T751 Receiver
Answers & Comments
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.
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.
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!
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.
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 [email protected]