Does a brand new electrical circuit for audio gear benefit from burn in/break in time?

Sonic memory is an ephemeral thing. 

I had to look up the definition of "ephemeral" but I completely agree with you.  After listening to something I can come away with impressions and feelings and emotions about it, but then later on down the line I cannot replicate the experience.

I’ve sort of given up on scientific explanations- I just roll with it, pray to the audio gods, and if it all turns on and doesn’t blow up, I consider it a successful day. :)

@whart I guess I am kind with you on that. I’d always kind of like a scientific explanation, it would make believing in something easier, but more than half the time I cannot understand the scientific explanations that I do get.

I did post this question because I just finished up redoing the dedicated circuits in my listening room, and that included all new Romex from outlets to the panel. I am sort thinking that maybe things sound a bit ’hard’ (but I am not sure). I just recently had to put four (of the six) original Russian EH 6SN7s back in my preamp, and I had been thinking that this was what I was hearing, but tonight, with all this dedicated circuit stuff on my mind, I got to wondering about the effects of having brand new, unused Romex feeding everything. I know that putting those 4 EHs back in my pre sounds like a no-brainer of a reason, but I still have two pretty good vintage tubes in the balanced input sockets, and when I had it configured that way before (two vintage tubes in the inputs with four EHs behind that pair) I don’t remember feeling that way about the sound.

But perceptions of and memories about (sound) are funny and I digress. But that’s why I was wondering about Romex burn-in.

they do not reseat all connections, power and signal

I will certainly give that a try, @ieales  .