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

@akg_ca 

Thanks for relating your experience. Sounds like you had a good test situation. When I recently put in a new direct line, I noticed a substantial increase in sound quality, but not change after that. But I wasn’t paying close attention, but I tend to notice changes in sound quality.

Nope: no "burn in" effects.

I'll wager not one of the respondents fully disconnected their system and re-connected prior to the miraculous improvements...

@ghdprentice 

my experience too …. A new 20A line over a 15A line ( both dedicated ) provided a higher degree of slam right off the bat  …this was kinda expected somewhat with more amp headroom maybe, I guess ?

but nada further improvement after that .

While I have been the first to use outlets in a room for my hifi (new house), I have never A/B’d before and after. Saying that, I would doubt that whether it was a space heater or an amplifier, anything would change after 100-200 hours of use.