op should hopefully understand that a tube tester can test a power tube for basic function but no tube tester ramps up the tube with bias currents that resemble in use conditions of real hifi tube amplifiers
not even close
so many tube testers will show power tubes like 6550 6L6 6CA7 as ok but then you put it in a tube amp play music and sh&t happens
not even close
so many tube testers will show power tubes like 6550 6L6 6CA7 as ok but then you put it in a tube amp play music and sh&t happens