Hi. I recently bought a used Hartke LH1000 head with a Hartke Hydrive 410 cab. I love the purchase! But yesterday I had a gig at a venue where I was getting a very loud buzz from the amp (hasn't happened elsewhere). If this is a grounding issue from the place, could I use a cheater on the amp's power plug to solve this? Or any other suggestions? Thanks! Javier.