Bastanu, I'm sorry to read of the issue you have with the A300. I don't know where you are located, but it would seem to me that given the problem (transistors fried), that would be fixable by your local (and reputable) electronics repair shop. It would probably cost around $150, and even if you do upgrade to a new/better amp it may still be worth it. Just a thought. Also, while I'm not completely surprised the area rep isn't returning calls, have you talked to the dealer (your point of purchase)?