Thanks again for your reply. A few days later I tried turning on the amplifier again, and after 15 minutes clipping all the time, it kept 5 minutes working fine (then it turned off lonely) I disconnected from power suply and reconected again and it worked fine without any problem for two hours. I could test by the headphones imput it was working fantastic. The same next day.-
Then I decided to put the cabinet on the chasis again and when I connected to the amplifier speaker. When I plugged it in it produced a boom sound and within a second I turned it off and there was this burning smell after which I dismantled the amp head and was able to determine that the TDA7293 I.C was burnt to death.
The amplifier keeps working on the headphones imput but there´s no way to make it sounds by the speaker.-
I decided to try a technical support but 3 of those TDA7293 pieces were replaced with the same results .-
Some other suggestion?
Million thanks