Best way to break in a tube amp? With cheap tubes?

[1]What's the best way to break-in a tube-amp?
[2]Should it be left on continuously for a few days
or in separate time-segments?
[3]If I have cheap tubes and better tubes, should the
break-in be done with the cheap ones?
[4]Do the tubes themselves need to break in?
[5]Would you do anything differently for a preamp
vs. a power amp?
Thanks in advance for any thoughts on this.

Showing 2 responses by rgs92

Thanks for the advice everybody. One more thing--
does anyone use tube dampers (vibration control devices
or coolers of any sort)? Thanks again.
Thanks Cyconlicman--I like the metaphor.