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To get a little more in depth why "Burnning In" is more or less due to the owners fear than anything else.
Vaccum Tubes consisted of filiments, elements, grids, and discs that in order to work properly needed heat. And like any filiment the first time you turn it on it does not heat evenly for a matter of time or it fails due to impurities or manufacturing tollerances. So you actually turned it on an let it set in order to even out. Vaccum tubes needed this heat in order to excite electrons in the gas which was in the glass enclosure.
Solid state electronics do not need heat to work and the heat generated is due to resistance to electron flow. And since heat is not needed there is a lot of time and money devoted to getting rid of this heat using cooling devices or better less resistant materials.
Solid state electronics either work or they don't and it is impossible to tell wheather they will fail in an hour or a lifetime. ANd 24 hours of running a program loop isn't going to tell you anything other than your HSF and Cooling may be lousy.
Basically it is a waste of time.
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