AVA Van Alstine SET 400 amplifier -- burn in?

Break In, not burn in..

The manufacture probable lets them percolate for 1-200 hours before you get it. EVERYTHING breaks in.. Period.. He just may have bench tested enough that YOUR changes will be very subtle. Usually after the first 45 minutes to an hour, thing quit sounding wonky and settle in. In about a week you'll get use to it. That's when I notice if something get messed with..  Tone control (the wife will change the tone control.. :-)

Teflon caps I have to leave the room 200 hours.. at least.. I quit using them because of the long break in times..
I went to copper foil. Night and day..

I have two of the AVA SET amps - I think they do settle in a bit with break in, but both sounded great out of the box.

The caps in my amp were switched out to Teflon, which is the 24 hour warm up time. 
  The odyssey amps are crazy nuts with break in or burn, or whatever it’s called.  They did take several hundred hours,....very odd, but the reward was worth it, I was so excited each day to listen, I was met with a different sound every other day it seemed,
   After a couple months of continuously on, it was a truthful strange ride to get where I’m at now, the real transformation in sound is something I’ve never done before. 
 I do shut them off , and t takes about 2 days for them to get back to that kismet tone-sound.  
 Even my aging yammy receiver I use to record LP’s to my computer I warm up for a day to warm up. 

Thanks for the replies so far. Very helpful.

Looking forward to hearing it! I will let it "break in" and give it a bunch of time. I'll post some initial and some later observations, if I can. The manufacturer does not run them as far as I can tell. I asked but he only said what I relayed. Somewhat hard to know what he meant.

Most AVA enthusiasts are over on AudioCircle.  Might be worth asking the same question there.