Break in period

If I may "explore" Shadorne's comments above, we may find similarity rather than disagreement:

My point was that audio engineers [would aim to] design things to sound consistent and significant audible changes ascribed to [any number of parametres, one of which is] lengthy burn-ins (after months of listening) (...)[may] not be very desirable [since it could result in performance variations between otherwise identical pieces of equipment]

.
I wouldn;t think anyone is doubting that -- if I catch Shadorne's drift.

The fact that there IS some change in performance is all the more interesting.

A note about wires, referred to by Atma above: one of the most boringly annoying such situations must be changing the tonearm wire. Once changed "for the better" the new wire often takes an PIA time to "settle"/burn/break or whatever it is or takes for it to sound normal/itself...

Shadorne, your second paragraph comes close. If you like the sound of lets say, Dynamicaps, and decide to use them when you build or modify an amp, they will change ever so slightly the first few hours of use. That is irrespective of your design.

However, this is not necessarily a lengthy process nor is a frustrating one. Dynamicaps do most of their settling within 4 hours or so, and I always get a big kick out of hearing the very subtle improvement as I spin the first 6 to 7 LPs. It’s almost like watching your child getting born, only less costly. Makes all the soldering worthwhile.

Tone arm wire and step-ups take forever to burn in. This is due to the very low voltages going through them. (< 0.005 volt in the case of many MCs). I put them on my cooker and run 2 volts through them for a few hours. Believe me, they’re well burned-in after that.

More than likely the stuff you bought were run for a few hours at the factory for shake down tests. That would all but run-in most components inside your gear.

Regards
Paul

Look into Blackgate capcitors. This is something I have saved. I have Blckgate caps in my Denon 5910 plus other little goodies. The unit sounded great at 500 hours and it was not done cooking. 1000 hours and another blanket was lifted from the speakers. I am sure equipment varies in break in period but It happens and it can happen in a big way.

It can take many hundreds of hours before the maximum sonic benefits can be heard in audio circuits that use Black Gates. This long settling-in procedure is often a controversial issue when auditioning such equipment, as the frequency responses will tend to shift around greatly during this period - making the equipment sound different from one audition to another. Once completely 'burnt-in' however, the benefits can be heard clearly.

Black Gate is made by Rubycon Corp. of Japan.