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Questions about tubes and gear that glows. FAQ

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RE: Tubes tested & burned in

Posted by Jim McShane on February 16, 2017 at 15:50:15:
You're grasping at straws IMHO. While any individual tube can't be changed once it's made, the overall quality of any production run of tubes is raised by eliminating tubes with issues.
Why do you think automotive quality ratings are measured by the number of problems per 100 vehicles?
Quality is judged by evaluation/analysis of a reasonably sized sample of the product being evaluated. By weeding out problematic items from the sample the overall quality level goes up. And any individual consumer is more likely to have a satisfactory experience with the product as a result.
Finally, think of it this way. If a customer buys a quad of tubes from me and one fails, is it accurate to say that tubes I sell fail at a 25% rate? Well, if you limit it to tubes sold to him - yes. But not when the sample is larger because only a few purchasers have a 25% failure rate. Most have a 0% rate! Which means that the more infant mortality prone tubes I weed out the better the odds of any given purchaser having a 0% failure rate - THE BETTER THE OVERALL QUALITY for any given purchaser. That's why proper testing and all that go with it - including burn-in/run-in - is one path to improved quality.
That's all I have to say on this.