I’ve had the Maraschino’s for over 6 months now and since then they have been in operation 24/7 around the clock making music, so “if there was” any break in period, it wasn’t apparent and moreover it has long since past.
Right from the get go it was obvious in the most obvious sense of being obvious, that straight out of the box without any warm up, these amps are a massive step up from every single ended triode I’ve ever heard. So if there was any break in, it probably isn’t perceivable since these are gobsmacking good right out of the box with sound quality that stomps all over the finest tube amps. Seriously, there isn’t another amp regardless of price that I’d touch with a 10’ pole.