My head needs to be repaired and I'm not really sure what to do. Whenever it's on, for time to time there will be this crackling noise for about 30 seconds and then it will go away for a while (this is without anything plugged in). It's also uber distorted when I play. It's like someone is playing what I'm playing at about 1/2 volume, but with some raspy distortion. I think (and I've been told) it's a good change there is a leak in the power part of my amp, but I'm not sure so I'm posting it here. Do I need to send my head back to Ampeg or can I pay someone to fix it?