B&K EX-442 Sonata Series

Assuming it's not the front rocker switch, then there might be a bigger problem. I owned a EX-442 Sonata, and twice over a period of about 3 years, several of the output transistors failed. This in turn blew out the internal rail fuses. B&K thought the probable cause was short circuiting. I'm very careful of that sort of thing and was reasonably sure this did not happen. Although I have no logical explanation for the failure. I asked the designer that when the rail fuses blew, why this didn't protect the output transistors. I said the rail fuses seemed sort of redundant if they didn't protect the output transistors. He seemed a little irritated with me for saying this,and gave me some technical explanation of which I don't remember as this was back in the early 90's. Still seemed a bit strange that the fuses failed to protect the unit especially when it happened twice. I only know of this happening to my unit and no one elses. So not sure if this was/is a common problem.