The Hi-fi audiophile types, tend to believe in burn-in for electronic components like amplifiers. That is the sound of the item improves with use over the first few months from new. They will often leave amps switched on, or take them through on/off cycles to achieve this more quickly. Does this apply or matter with instrument amps? I have just taken delivery of a new Trickfish B1k, and I am on/off cycling it prior to its first gig, but that is because I have had two Class D SMPS amps fail (not Trickfish; Markbass and AER actually) during the first few weeks of gigging.