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

Here are just a few sentences (verbatim), from a letter that Brent Jesse includes, when you receive tubes purchased from him:  "New tubes need a break-in period before they can exhibit their true sonic character when used in audio circuits.       Preamp tubes especially benefit from a good break-in.       This period may vary widely, but NOS vintage tubes usually need at least 48 hours of use, sometimes up to 100 hours.       New current production tubes need 24-48 hours typically.       Good break-in can be accomplished by either leaving your tube unit turned on for 2 days in a no signal condition, or you can just enjoy the tubes for several hours each evening and they will be broken in after several weeks."         An opinion from another highly regarded (personally, at least) source, on power tube burn-in: https://tctubes.com/power-tube-testing.aspx        Upscale burns theirs in for 72 hours, before testing:  https://upscaleaudio.com/pages/test-equipment       interesting:     https://www.youtube.com/watch?reload=9&v=jwmDf5bSRMQ

I would rather go on "or you can just enjoy the tubes for several hours each evening".

@rodman99999 @hilde45 

thanks guys. They are to come in on friday.

Ill probably go with @petg60 

Burning in while listening also adds to your experience. The process can be quite subtle, very obvious, or something in between and you gain more understanding hearing the changes.

+1 @melvinjames 

One of the interesting things about this hobby for me is trying to pay attention to different stages of break-in.

People who I know who have been in this hobby for a long time will talk about the various changes that tubes and cables can go through before they reach a level of maturity.

I think that kind of self education and how things sound is a wonderful part of the hobby and it serves well for down the road because one becomes more sophisticated about what they're hearing and what perhaps is causing it.