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VT-231 tube hum

Posted by akolegov on January 6, 2017 at 11:20:05:
I installed a pair of Sylvania 6SN7GT/VT-231 tubes in my amp. The tubes were purchased as NOS from a reputable dealer several years ago. One of the tubes instantaneously produced a very loud low frequency hum, which means that it is faulty. I wonder what could be the reason for such failure, if the tube was kept in a drawer for several years. The same thing happened earlier with one of JAN GE 6550 tubes and one of Siemens/RCA 6922 tubes.