Some 'a them tubes got saggy screens!
And yes it IS annoying to have to personally buy inventory for an outfit that ought to stock their own. I can tell you stories ... in any case every tour I did, I had to bring my toolbox as well as a stash of tubes, fuses, and all sorts of parts. Came in handy many times, for the band gear as well as the PA/Monitor rigs. Sometimes even the lighting gear. But I always got heat from management when I submitted bills for the parts I used. Had to let 'em know, you can either do it my way, or YOU carry spares and pay for them, or go into a panic when something crashes and maybe not have a show. So... what's it gonna be? Another Rodney Dangerfield moment, no respect. Repeat ad infinitum.