Hello
I hope this is the right forum for this kind of questions.
I own an integrated NAD C325 BEE amplifier. It is more than three years old, so no warranties anymore. I have the amp next to my desk, on a shelf.
Yesterday I suddenly heard a sound. It was not loud. It was as if you put a wet kettle on a hot stove, and the leftover waterdrops boil and escape from under the kettle, making a protracted whining sound.
I quickly turned off the amplifier (the front panel's standby switch), but the sound did not stop. Then I turned the main power switch to "off" position and the sound went away almost immediately.
I wish to know, can I put the power back on to locate the sound, with cover opened? I happen to have the service manual for this amplifier, but I am unsure if it covers this kind of failure. I also would not like to have the power supply explode while I am looking at it.
If you were in my place, how would you proceed?
I hope this is the right forum for this kind of questions.
I own an integrated NAD C325 BEE amplifier. It is more than three years old, so no warranties anymore. I have the amp next to my desk, on a shelf.
Yesterday I suddenly heard a sound. It was not loud. It was as if you put a wet kettle on a hot stove, and the leftover waterdrops boil and escape from under the kettle, making a protracted whining sound.
I quickly turned off the amplifier (the front panel's standby switch), but the sound did not stop. Then I turned the main power switch to "off" position and the sound went away almost immediately.
I wish to know, can I put the power back on to locate the sound, with cover opened? I happen to have the service manual for this amplifier, but I am unsure if it covers this kind of failure. I also would not like to have the power supply explode while I am looking at it.
If you were in my place, how would you proceed?
I would say it sounds like a main smoothing capacitor.
Proceed with caution and wear eye protection if you power it up again with the lid off. I would think you will see the issue with the lid off and no power. Look for bulging/bulged capacitors.
Proceed with caution and wear eye protection if you power it up again with the lid off. I would think you will see the issue with the lid off and no power. Look for bulging/bulged capacitors.
NAD of that era suffer from quality of parts ... The sound you heard sounds like a blow capacitor and you dont need to power it up to listen with your ears .
Situation like that will be something that can be seen with a naked eye
you expect to see something like in the right side of the picture
Then the suspects are C413 and 414 in the secondary power supply and are marginal from all aspects voltage/temperature/capacitance I could go for something bigger there
This is what fails mostly still it could be any of the capacitors
Kind regards
Sakis
Situation like that will be something that can be seen with a naked eye
you expect to see something like in the right side of the picture
Then the suspects are C413 and 414 in the secondary power supply and are marginal from all aspects voltage/temperature/capacitance I could go for something bigger there
This is what fails mostly still it could be any of the capacitors
Kind regards
Sakis
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