Ok. I have an SVT-CL Ampeg and I've only had it for about 5 months. It gets about 2 hours of playing time a week and I take extremely good care of it. For the past few months, whenever I play, at random times it makes two short noises like tsk-tsk really qucikly and moderately loud. I've tried my ampeg cab, my aguilar, cabs, a jazz, and a stingray. It's definitely the head. It makes it at random times and every once in a while while in standby for a minute. Any ideas on what is wrong?