You are plugged into a 2x12 cab, at gig volume, and for some reason one speaker fails: • If the cab has two 8-Ohm speakers wired in series for a 16-Ohm load, the show is over, as the whole cab goes silent, while your tube amp no longer sees a load, or rather sees an infinite impedance load. Nevertheless, the show may not be over for your amp too, as hearing no sound will prompt you to power it off so as to investigate the problem. How long do you really have, though, before flyback voltage fries the output transformer? • If the cab has two 16-Ohm speakers wired in parallel for an 8-Ohm load, the show will go on, as one speaker will still be working, and you playing, while the amp still has a load on it. Still expecting to see an 8-Ohm load, however, your amp will now see the 16-Ohm one of the remaining speaker, while, although it will now put out less power, it may still be quite some time before you realize that you are actually playing through just one speaker, so as to do something about it. Am I right to assume that the output transformer is more likely to survive the increased impedance load, double in this case, much longer than no load at all?