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I saw this the other day, a manufacturer recommending a 600 hour 'burn-in' period!

What elements in modern electronics can possibly take 600 hours to 'burn-in'?

What does 'burn-in' even mean, does the manufacturer expect the specifications of components to change, and if they do why can't they deliver a product which has already reached its operational specification.

These products nearly always seem to improve after 'burn-in' hardly ever do you hear of a product's sound quality worsening!

I even saw an 'isolation' device for  which the manufacturer recommended a short 'burn-in' period!

 I would like to collate all the most ridiculous...

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