mortonP said:In theory any solid state audio should always sound the same but there are people who believe a SS amp will sound different after warming up. Can't say I ever noticed any dif myself though.
Warm-up is NOT the same thing as break-in. Most Class A amplifiers have DC biasing circuitry to compensate for temperature variation in the output stage components. This has nothing to do with the idea that an op amp somehow changes over weeks of normal operation.
There is such a thing as wire biasing. I remember reading about it many many years ago. I forget much of the detail now.
Citation needed.