Tubes glow unevenly whent starting up?
My little Elekit TU-879S amp uses EH 6L6GC tubes. Used them for little over one year. I moved my amp beneath a shelf and now have noticed that when starting up, one gets bright on bottom, the other gets bright on the top. After they warm up the glow evens out. Switch sockets and they maintain this behavior. Is this normal? How long can I expect these tubes to last? I have used them nearly daily for several hours a day for about the last year and half.
P.S. Tried search but really could not find anything.
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