[Spirulina780]

How many hours should i burn in my new amplifier before it´s burned in?

 

[ProtegeManiac]

Warm it up for half an hour to an hour and don't even think about burn in, just warm up and sit back to enjoy the system.

 

[Jenson]

^Agree, I have not "burned in" my tube amplifier at all. I switch it on and wait until tubes glow properly, then start listen to music. It takes around 1-2  minutes until tubes are ready. I have not noticed that my amp would have been sounded different after 10, 20 or 30 hours. Maybe that burn-in means that you adjust your ears to new amplifier 

 
Some people claim that they hear difference. I am not denying they can't hear that, just saying I can not hear any difference. What comes to different tubes is another story, then even I can hear some differences.

 

[tomb]

There is some initial burn-in that takes place with capacitors, etc., but it's nowhere near the "hours" you hear many people claim - more like a few minutes or less.
 
In the case of tubes, NOS tubes can be gassy after sitting on the shelf (or worse) for a few decades.  It may take some extended running (it might be hours in this case) before they settle down.  From then on, a few minutes should suffice.

 

[Spirulina780]

After playing the amp for 3-4 days, it sound considerably better