I've build a 2 channel 1073 (my first diy build). Both channels amplifies the mic signal which is good 
. Unfortunately, one of the channels makes this noise when I'm adjusting the trim pot (trim from low to high): https://www.dropbox.com/s/aauso4rlpb4xhb3/Noise%201073.mp3?dl=0. When I run the preamp with higher gain settings, the noise is occurring earlier compared to a low gain setting.
Does anyone have any suggestions or ideas of what is (or what is not) causing the problem? I really don't know.
. Unfortunately, one of the channels makes this noise when I'm adjusting the trim pot (trim from low to high): https://www.dropbox.com/s/aauso4rlpb4xhb3/Noise%201073.mp3?dl=0. When I run the preamp with higher gain settings, the noise is occurring earlier compared to a low gain setting. Does anyone have any suggestions or ideas of what is (or what is not) causing the problem? I really don't know.
