kenwood kac9104 cutting out

[Hexhclass]

This amp plays good audio at low volume.when i turn up thegain and bass bost the audio cuts in and out.It act like the amp is losing power.It has 32.1mv on the speaker terminals with no signal.I try two other speakers but no change.any idea what could be the problem?

 

[Perry Babin]

Is the voltage (measured directly) across the B+ and ground terminals dropping?

If so, how far does the voltage drop?

 

[Hexhclass]

The voltage was drouping to 10v .I solder the output and power supply section and it seem to be ok now.

 

[Perry Babin]

Are any of the output transistors leaking or shorted?