Sudden loud crackling on 520C

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23-Jul-2017 08:01 AM

Fozzie13

Fozzie13

Posts: 4

I changed all the electrolytic capacitors about a year ago and the amp has been fine ever since but yesterday all of a sudden I got a loud crackling noise beating regularly a sort of brrrrr.

Had a look inside but I couldn't see anything amiss.

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23-Jul-2017 04:25 PM

Not Available

Posts: 6

Hi Fozzie13,

Did you check the resistors in the + and - supply voltage lines of the op amp?

They might look OK but check them with a multimeter.

If one of these two is infinite then the + and - voltage shift and a "brrrrr" is heard.

Good luck.

Harry

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24-Jul-2017 08:24 PM

Fozzie13

Fozzie13

Posts: 4

Right, having done some checking there is no signal from the left hand channel. The red and black leads from the power supply board to the LH channel board are not showing any power at all. Is this pointing to renewing the 2 10000uF 63V electrolytic capacitors on the left hand channel side of the power supply board?

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