Rune

Noise 1073
« on: December 07, 2017, 04:40:42 AM »
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.


ruffrecords

Re: Noise 1073
« Reply #1 on: December 07, 2017, 11:57:03 AM »
Sounds a bit like motorboating to me. Check your power supply decoupling at every stage.

Cheers

Ian
www.customtubeconsoles.com
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'