House hit by lightning

Try to plug it into a differen outlet. Also unplug it and open the case and look for a glass tube should be small and see if you have one in that case. If not then the cost to repair is high. You should get an estimate of how much the local repair should would charge you first. If it cost too much than what a new one would cost then don't repair it keep the speakers and get rid of the amp. But a new amp or another system if you want.