I am getting some new tubes for my amp, and I want to do a 24-hour burn in. How?

@petg60 yeah. Thanks!

For new/NOS tubes, transducers (cartridge, speakers), new amp...etc. I’ve always just listened to music and not sweat the burn in. If a piece is defective or you just don’t like its sound in the context of your system, you’ll know if from the onset and burn in won’t help much, or at all.  Music is more enjoyable versus pink noise or test tracks.

@gakerty thanks!

OP, gotcha. It does change the sound, and (again) it's interesting to hear the changes.

I'm amazed at how many people are telling you to just plug it in -- as if there are not a million threads about tweaks, techniques, etc. You're asking a reasonable question that many have asked before (in one form or another) and you're getting your head patted as if you were over-worrying. This is a hobby and we're on a hobbyists' forum and you're asking a hobbyists' question. 

@hilde45 thanks man. Yeah, there are a lot of people saying different things. Thanks for clearing it up though.

so you suggest I leave it on standby for about 24 hrs?