Tubes Asylum Questions about tubes and gear that glows. FAQ

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RE: Tubes need "re-burn in"?

Posted by Jim McShane (D) on August 3, 2017 at 14:42:10

In Reply to: RE: Tubes need "re-burn in"? posted by Sondek on August 3, 2017 at 11:05:42:

You and Lee are both on the right track...

1. Internal tube parts can continue to outgas while the tube is just sitting in storage. If the getter is in decent shape it can absorb the gas when the tube gets hot - but until it does the tube may not behave itself. It's best to run it a while on a test rig or ?? if possible before putting it into service.

2. Cathodes can become contaminated ("poisoned") and until/unless the contamination is gone the tube's cathode performance is compromised.

Be careful, especially with used power tubes! I recently got a SMALL batch of NOS Ei KT-90 type II that had been on the shelf for years and 4 of the 6 tubes had high gas levels which could have resulted in them running away in an amp. I ran them in my match/test rig for an hour each and the gas was gone - the tubes were perfect.

I hope this explanation helped!

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