break-in--bane or boon ??


as a reviewer , i often receive equipment which is new and has no playing time.

i have to decide whether to break in the component and if so, how many hours is necessary.

i have often asked manufacturers for guidance.

one cable manufacturer said the cables--digital, analog and power, required no break in. another said 24 hours.

when i reviewed a mcintosh tube preamp, i was told by a technician that no break in was necessary. all i needed to do was leave the preamp on for one hour in order that the tubes were "warmed up"

can someone provide an objective explanation as to the basis for break-in and how to determine how long to break in different components ?

for example, cables comprised of different metals, if they require break in, is there a difference in the requisite time for a given metal, e.g., gold, silver or copper ?

can someone provide an explanation as to what is happening during the break-in process ?

can one devise a mathematical equation to quantify break-in hours, as a function of the parts in a component ?
mrtennis
BTW, I'm sitting watching the Orioles pound the Yankees.

Can anybody explain that one to me?
I'm sure I'm wrong. I realize now that my feelings towards cable break in stem from my unresolving systems. Ive never enjoyed revealing gear because I don't like to fiddle around that much with gear. I'm more into enjoying music than constantly reworking my system. I'm sure I would notice break in of cables in some circumstances but not with Harbeths and a Rogue Cronus Magnum. I'm looking into solid state and if I go that route maybe I can realize what you're all referring to.
Trelja, nice conversation/argumentation; this is the way it can be on audio forums. :)

You seemed to be indicating there may be variances between hand built units. If there was zero variance, i.e. all two units were built at the same time with doubles of parts, then my point falls to the ground. It seemed, however, that you were referring to units built over a period of time, so I made my point.

I have been consistent all along, and I believe my comments about whether a cap shows signal change is also consistent. My point is that even if it does cause sonic change, 1. Does it pass the threshold of hearing, and 2. Does it show noticeably different sound when compared side by side to a new unit?

My points are quite straightforward, and I believe the only way to resolve the issue is not through logic and argumentation, but by simple comparison of units - which is why I did so. I wanted the answer, not opinion. :)

Regarding your last comment on cabling; Well, there you go. You think I sound like a skeptic, and I think you sound like a subjectivist. :)

The cable skeptic says, "There is no difference between the sound of an assortment of cables." Well, I say there is, and I am not depending upon data to know it.

I'm saying, "There is no demonstrable difference (i.e. audible) between IDENTICAL UNITS over time. You say the data exists, but I have conducted the test and didn't hear it.

The two propositions are not even remotely close. And you will note that the prototypical cable skepetic will not conduct even the most simple listening test. Why? Because they know! I think it's obvious I am willing to conduct the actual listening test.

I actually think people - and now I'm not directing this to you Trelja, but the community - are afraid to suggest that their perceptions can be unreliable over time. It's absurd to think that we have such perfect sonic recall that we can declare definitively that something we heard five weeks ago is changed from what we heard today, even though heard with the same set of gear, as if our perceptions are impervious to change! :(

It was earlier suggested by John that perhaps I was being influenced by anxiety or another psychological effect. Well,what about all those who are hopping in and out of the listening seat? Maybe their blood pressure is lower any given day? Maybe they didn't fight with the spouse and feel less tension, etc. Maybe they are less tired... You want to talk about ANXIETY - how about the guy who really isn't super excited about the sound of his new $XXXX toy, but is desperately hoping 300 hours of Burn In transform it! Can you say heart palpatation as he settles into the chair? Tee hee hee, man, I could run with this argument, but I think I've made my point.

Sorry, it's too simplistic to declare that Burn In is 'real' when it comes to temporally stretched out casual observations. :)
I would love to have someone do a a/b test between factory cables and burned in cables with me. I'm dying to hear this change in the presence of someone who's experienced it. I will not deny it but I'm sure its system dependant.
Mapman, I couldn't stop laughing at that one.
Aren't the Yankees damned anyway?
Thanks.

Al, I understand the other variables you mention but if the ones you list were the ones responsible, then the improvement wouldn't stick around as long as it has. The improvement would come and go depending on time, weather and what have you. What I hear is constant. Consistent.

As for my anticipating in other recordings what I hear in the first one that I hear an improvement in, it has never been of the same amount or degree due to the different quality levels of the recording and pressing. I'll even go to the trouble of bearing through some mediocre recordings to see if they benefit from the burn in improvement and most of the time, they don't. They're still bad.

It takes a really good recording that I'm familiar with and others of that ilk when it comes to evaluating and appreciating the improvements.

For the life of me, in all the years I've been listening, I can't understand why some people can't hear what I hear while others do. I'm glad I do and feel sorry for those who don't (please understand that I'm not condescending).

As for a methodology that would, or could, ascertain break in or burn in of a cap, wire, chip, etc. I don't see how it could be reliably done. Everyone would have to be present when it happens. And when would it happen? And would everyone have the hearing acuity to discern it? Would the system be of a revealing enough nature to demonstrate it? It wouldn't be repeatable as once it's burnt in, it wouldn't happen again. Everyone would have to be imminently familiar with all the recordings as one would not suffice. It would be too onerous a task.

I feel it would have to be in a relaxed setting that one is intimately familiar with, with recordings that one is intimately familiar with, with no time constraints, and no anticipation involved. The very nature of burn in would dictate this approach.

As for validity, I hate to sound like a politician, but trust me.

As for veracity, see above :-)

All the best,
Nonoise