Last time I blew a tube it took some resistors and a fuse with it.
So now we’re talking about having a spare fuse, some resistors, a soldering iron, and a screwdriver to open up my amp.
Honestly at a gig when I have amp or guitar problems, I don’t want to troubleshoot. I want to switch to a new amp or guitar ASAP.
Though really, I don’t think a .22 caliber would fit my needs for an emergency backup. I need at least 2 channels with independent volume controls, and a bit more power than that