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

Burn in??????!

Tubes sound and perform best during their first 100 hours. Their very best the first 50 hours. They continually degrade after that.

Agree with mapman- why waste tube life- you don't put your car on rollers to bed the tyres in, you just take it easy for a while or end up in a hedge.

Keep a diary of hours and perceived sound if you're that anal unless it's the istant gratification of a bedded in system you're after.

On, no signal needed, 60 hrs, burn-in is done.

I bought tubes from Brent Jesse. 

Did NOT like them. 

He said, ok, finish burning them in, then keep or return them. Top line were his instructions which I followed.

They did change slightly, I still did not like them. I picked another I knew I liked (I had used spares of them), half the price, full refund (I paid return shipping)

Sounded great brand new and GREATER after 40-60 hrs. 

The queen has someone to break in her shoes for her..

If you are buying from a quality tube dealer they already “burned” them in before they tested them. You should be good to go. I know with my tube preamp I like to turn on for one hour before listening or if I just start listening I know after an hour they hit their sweet spot. Bottom line enjoy the music!