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RE: How do KT120s fail?

I change power tubes once they start sounding thin in the mid-range, long before they would actually fail. This happens by the 1800-2000 hour mark with all the current production tubes I've tried (with various amplifiers). How long they would last before total failure I don't know: I would speculate another 1000 hours from what I've heard.


Edits: 11/26/14
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