I have got some experience actually teaching electronics but to a young age group. Intermittent faults on more complex device are a bit challenging! I've resoldered all the components in case of a dry joint. The amp works - then doesn't. Then does again. Then dies again. It's a torque 100w acoustic amp T1002AR. i SAW ONE FOR SALE WITH AN INTERMITTENT FAULT! mAYBE IT'S A THING... aNYONE GOT ANY SUGGESTIONS?