Alright. Kind of new to tube amps and not quite sure of all the dangers of running tube amps with no load. Hopefully someone can help explain and answer my questions. I was playing through my jet city jca20h plugged into my marshall 1960b 4x12 cab. I have my amp against my music room wall with just a little bit of room behind it to be able to access the cables and plug in the power cable. I was playing at about 11 or 11:30 last night at a more quiet level and our cat somehow got behind my amps and got tangled up in the speaker cable running from the head to the cab and pulled it partially out of the cab. As I was playing the sound suddenly went dim but never all the way out. As soon as I noticed the change in sound I hit my kill switch on my guitar and ran to the amp to see what was going on! As I looked behind the amp our cat was trying to free herself from being tangled in the cable and by this time the cable came all the way out and she scurried away. I quickly plugged it back in and put my amp in standby. Ive tested it out last night and this evening and nothing seems to be wrong and still plays. Nothing ever blew out or smoked or was overly hot but im just really paranoid about that I may have done something to my setup. Like I said I got to test it a little bit this evening but cant come to a conclusion if it sounds the same or not. Hopefully someone can help out! Thanks!