Love getting new equipment, hate the break-in

I can attest to the fact that components and speakers require time to burn in and sound their best.  This phenomenon became apparent to me when I upgraded from Cambridge Azur separates to a Macintosh MA12000 integrated amplifier and then to Accuphase separates that consist of an A48-S Class-A amplifier,  a C2300 preamplifier,  and a DC-37 Processor. Both the McIntosh and Accuphase sounded horrible and not like the unit(s) I demo’d at the store.  Then gradually they sounded better and after 200 hours or so, both sounded incredible. My Accuphase components really open up after a good hour of listening and become more airy, micro details and subtleties more prevalent, musically engaging, sonorous and dynamic. It’s strange but during the 1st hour the gain on my Accuphase amplifier is set low but then I set it to the highest gain and this is where the magic happens that I talked about. So I’m a firm believer in both burn-in and warm-up. 

I like burn-in.  What else gets better as it is used?  Doing so with a pair of NOS NIB 1958 Western Electric JW 2C51 now.  I think it’s astonishing that such things exist 67 years after being made.  They existed before I did...shoot my parents hadn't even met yet.  Only about 12 hours in (2 evenings) but quite noticeable sonic improvement over the last 2 hours.  Look forward to what they bring to our system moving forward.

Oldest NOS NIB tubes I’ve burned-in: pair of 1949 Sylvania ladder plate 6BL7GT...that was a fun burn-in!

Break in is a myth promulgated by people who "know what they hear" despite any objective evidence. The only possible exception, is speakers, but many factories test them before they send them out so that process is already done or almost so. Even then, if the sound changes, it will be so minimal as to be basically unnoticeable. 

Ask yourself this. Why is it that when items "burn in" they always get better sounding? 

OP

same here. I started my serious journey info Hifi only during covid

and all my equipment are brand new, everything, so the break-in starts when I get it and learning how it affects the sound took months or weeks before all falls into place. some I have no way to return it as it passes the trial period, so it ended up in in eBay and some I get to keep as the magic happened.

yes, break in sucks but heck, at least you know its brand new. however, if you like instant gratification, buy Used

Burn/break in is not a myth, for instance capacitors take time to form, this alone may account for much of what we hear during burn in. Many other parts may also benefit from on/off cycling and burn in. Just because science and measurement protocols haven't yet established a means to test for burn in doesn't mean it doesn't exist. To believe that is simply not how quality scientific inquiry works. Statements as to mass delusion in the minds of those who hear burn in are simply short cuts in order to convince oneself this phenomena doesn't exist. Also, based on long observation, not everyone pleased at the end of burn in, components continue to be sold and replaced.

In the end burn in is and should be a moot point, eventually the component or part will be fully burned in and a final evaluation is arrived at.