Check this out: I often see people asking about judging the condition of a tube by the condition of its getter... Here's a Sylvania 5933 which has seen years of use in my RCA power amplifier. The getter is almost gone, but yet the tubes bias properly, test good, and sound great. I have some spare time during the holidays, so decided to do some work on the RCA amps. I was thinking to install some NOS USSR G-807s I keep as spares for these amplifiers, but those 5933s just aren't done yet. Anyway this is definitely the case of worst looking getters in good tubesI've come across.