[TOMMYTHUNDERS]

So I was just playing... loud. I had the channels jumped and the amp dimed through a 4x12. Then all of a sudden no sound. Nothing. I hit the strings and I can hear the faintest sound through the speakers. Pull the cable I'm using to jumper out, fiddle with knobs, look at tubes... nothing. Sniff the back of the amp. Nothing unusual. Then I see that the speaker cable shook loose from the cab (not the snuggest jack). I flip the amp off immediately. Plug back in, turn on. Amp sounds and works fine. Did I do damage when the amp was on and plugged into nothing?