Noise in channel 2 Bose L1 compact

[Ricardo tejada]

Hi
My ampl Bose L1 compact is making a really crck noise on channel 2 after a Copple of hours, as I increase the volume the noise get stronger

It comes from my preamp board I have the schematic an I have my oscope but I can't find where is the noise coming from please help.

[Mick Bailey]

Welcome to the forum.

It could be a thermal fault, but a couple of hours is a long time for something to show. First call would be to chopstick the preamp board to see if there's a bad solder joint or connection. If that doesn't produce any results, set amp up with the preamp board accessible and blow hot hair onto the board to see if this hastens the noise appearing. If that induces the noise, then it's a case of using freeze spray to locate the defective component.