How to evaluate amps that are not broken in?

Whoaru99, very interesting point. I was thinking the same thing as I was reading the responses. I can imagine a situation where a component sounds wonderful and a change may not be perceived as better. Hmmm.
The only new component I've purchased lately is an Oppo DV-980H but I only bought it to use as a transport and I haven't noticed any changes. I have trouble thinking the data stream will change much over time.

Whoaru99, I couldn't comment-- I haven't owned enough new gear to have formed a strong opinion.

I thought everybody knew---The parts in 'some' amps take 400 hrs/ or longer. I'm sure many amps don't take that long. Many speakers are worse on break in.---Most all cables take 24/7 for 7 days.---Most digital takes that same as cables;amount of time.

>>Doesn't it seem odd that "break in" always seems to result in an improvement, never a change for the worse?<<

Which brings into discussion the emotion or mood at any particular listening session. I have no doubt that, to a certain extent, components change due to various electrical factors but not quite as much as these threads, some manufacturers, and some dealers would have you believe.

However, IMO, our current state of mind i.e. a good (bad) day at work, an argument with the spouse, a good game of golf, a lousy meal, time of day, etc. etc. play a much larger role in our evaluation of any listening session than minor changes in the components.

Break in is mostly due to our ears acclimating to the new component not the component undergoing some incredible transformation.

Or not.

I think warm up is much more important than break in.