quad 33/303 crackling noise @ startup

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14-Aug-2019 11:00 AM

V0ltair3

V0ltair3

Posts: 6

Hello,

I have a quad 33/303 setup that was revised with dada kits respectively a couple years ago. Recently I have started to notice a small cackling noise upon startup, mainly in one of the channels that goes for around 2 seconds and then it settles.

I suspected of the transistors, but I've replaced them all by BC550C as per dada kit, so I am not really sure where to look for..


Any advise from your experience ?


Thank you,

Ivo


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14-Aug-2019 11:28 AM

TJ

TJ

Posts: 9

If you unplug the 33 from the 303 does the crackle still happen?  This will show you which of the boxes is doing it.

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14-Aug-2019 02:36 PM

V0ltair3

V0ltair3

Posts: 6

Hi TJ,


Yes, I did the test and the issue isn't there anymore (I forgot to mention that fact above), so I am pinning it on the 33...


Ivo

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19-Aug-2019 09:45 AM

EJP

EJP

Posts: 1638

If you have all new transistors in the 33 I would be looking at cleaning the PCB contacts and all the pots with isopropyl alcohol.
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20-Aug-2019 05:40 PM

V0ltair3

V0ltair3

Posts: 6

Will try, thank you... sometimes the most simple approaches are the right ones :)

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