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service life of NU type 45 vs EML or other "45"

spwal, hi. It would be of interest to know now many hours of service the EML "45" tubes provided before sonic degradation made you want to change them. I have examples of type 45 approaching 80 years old that have strong emission. Who knows now many hundreds or thousands of hours they have run. Lifetime seems to be a major bugaboo in the boutique tube world. If I plunk down several hundreds of dollars for a pair of what are labeled type 45 tubes I would expect thousands of hours of life. It would appear that high cost does not indicate high quality. Premature failure is unacceptable. When you say your tubes didn't age evenly at all I am curious to know specifics. Were the tubes new at the outset or not? How long did they last? Thanks for taking the time. Enjoy your National Union 45's. NU made righteous tubes.


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