We do a lot of tone testing in my studio and the question came up about damaging an amp from having it on with no load. There was disagreement about what conditions will damage the amp. Obviously playing the amp with no load is bad news, but is it OK to switch from one cab to another without turning the amp off and back on? Is it damaging the amp to have it ON and no signal into it with no speaker hooked up? Does flipping it to standby protect it? We routinely unplug the amp from one cab and plug it into another without shutting the amp off and no problems so far but don't want to damage anything.