Disconnect or power off the circuit breaker

Not true, all SS gear needs to be on a minimum 24 hours, preferably in stand by mode. Tube guys will swear by that too. Why do you think most hi end gear has a power switch, then goes into standby?

I have never disconnected the break for several hours just to see.When I have disconnected it (to swap AC duplex in the wall.). well I changed something anyway! 
I doubt I would test the theory just to see if it exists.. But if someone out there whats to spend time doing so... be my guest. let us know!Also I agree SS gear if turned off for MANY hours does take a little while to sound it's best. I do not think two hours would matter much. More like 24 off, then yeah you need time for the gear to settle back to the best sound.

I’ve noticed a couple of different directions gear can take.

What the OP has described is I think what I’ve heard called "splashy." Extra cymbals, air and generally anything a Foley artist can do with a thunder machine. My Luxman’s are exibiting some of that during their first 100 hours. That is, the extra splash is disappearing. It’s something speaker makers know from listening to caps break in. They get less exuberant after a few hours.

On the other hand, I’ve heard the Audio Research 75 Watt tube integrated start off sweet, then get very hard, then finally mellow again, all within 45 minutes.



My Class D amps however are really hard and lifeless unless they have been on for 48 hours in a row.


Best,

E

The awesome power of expectation bias as work here.