What's the story here? Do such amps have other means of protecting tubes during start up? Or do they simply wear tubes out faster? Once they're fired up, is the idea to simply turn the volume down (guitar or amp) when they're not being played for a while instead? Are they to be avoided? I've got one at the moment (Classic 30) and I can't say it's ever bothered me. I'm also considering a new amp that doesn't have a standby either ... is it something that would put you off? Even if you liked everything else about the amp?