camp6578

Did anybody find an answer to the hissing problem with the Gallien Krueger 150s, I bought a 150E in November 2012. and it hisses real bad through the headphones, I took it back to the store and they sent it to the warranty distributor for Canada in Ontario, they returned it saying that the hiss was normal and they could not find anything wrong with the amp. The store here in BC said the same. I took the amp in yesterday to a repair shop the guy there said it was not normal and he would try and repair it. Has anybody had any luck getting the hissing to stop, do different headphones work?