@blueranger
If the amp doesn't sound good right out of the box, IMO no amount of "burn-in" is going to change that. I have owned a bunch of amps and have never heard the dramatic swings in performance that some here talk about. Once the capacitors are fully charged you should be well over 90 percent of the way to the final voicing - IMO. I wouldn't argue with folks who say there are minor improvements or that a touch of initial edginess may disappear after being powered up and playing music for a time (like a week or less) but with the 10 or more $5K - $20K amps I have owned (a couple of crappy ones but most very good), I have never once heard anything remotely approaching dramatic changes after hundreds of hours. Enjoy your new amps.
Immediately I noticed the music came out of a darker background and the music was sweeter and vocals clearer.What you are hearing is good. You should indeed expect to hear immediate improvements with your new amp, particularly since the new 14b3 has received excellent reviews.
If the amp doesn't sound good right out of the box, IMO no amount of "burn-in" is going to change that. I have owned a bunch of amps and have never heard the dramatic swings in performance that some here talk about. Once the capacitors are fully charged you should be well over 90 percent of the way to the final voicing - IMO. I wouldn't argue with folks who say there are minor improvements or that a touch of initial edginess may disappear after being powered up and playing music for a time (like a week or less) but with the 10 or more $5K - $20K amps I have owned (a couple of crappy ones but most very good), I have never once heard anything remotely approaching dramatic changes after hundreds of hours. Enjoy your new amps.