I’ll say it again:
anyone with tubes should give themselves the gift of a basic tube tester. nothing fancy, just shorts, signal strength.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=tube+tester&_...
get or download it's manual, so you know how to operate it.
test the new ones when you buy them. make notes. test them yearly, I do it before thanksgiving every year, ready for the holidays.
test if you have any confidence issues, more than likely you will rule out the tubes; perhaps find a short; after a LONG time see some strength diminishment, and: equal diminishment? still matched strength?
and, if you find tubes persistently weakening rapidly, as you are concerned specifically ......
anyone with tubes should give themselves the gift of a basic tube tester. nothing fancy, just shorts, signal strength.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=tube+tester&_...
get or download it's manual, so you know how to operate it.
test the new ones when you buy them. make notes. test them yearly, I do it before thanksgiving every year, ready for the holidays.
test if you have any confidence issues, more than likely you will rule out the tubes; perhaps find a short; after a LONG time see some strength diminishment, and: equal diminishment? still matched strength?
and, if you find tubes persistently weakening rapidly, as you are concerned specifically ......