I do not know what is the problem. I had it connected to my preamp (which i fixed not long ago), but apparentally the preamp does not work as well (I did not expect that, because I fixed it and it worked fine). So now i tested it without the preamp and I does not burn any resistors anymore. But still, no music coming out from the amp. I connect the leads from my phone jack straight to the amp connectors and the speaker gives of this crunchy sound, it is pretty loud and does not sound like any music with distortion, more like random noise. And no, connecting to ground does not cause the burning, something in my preamp must be broken (again).