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Questions about tubes and gear that glows. FAQ

RE: Tubes tested & burned in for 48 hours at audio research

The 48 hour burn will cull out most early death tubes, they should also hold test and matching values better. It costs about $2 to do. However, any good tube re-seller will burn in power tubes.

Burn-in does not do anything to the tube that running it in equipment will not do.
It does not change the tube in any positive way compared to normal operation in equipment. It will, however, use up 48 hours of the tubes life. On a 2000 hour tube, that is 2.5% of its life.

This process allows the selection and individual measured characteristics of the tube to be less variable early in the tube life.

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