Does a tube need the break-in hours?


Most probably not, but not sure why :) 
Does anybody know a good substitution for 12AT7WA tubes? I have bought 8 of them about 10
years ago for Manley Stingray. Now, when I need a replacement, none of them are good
(ones are labeled by Manley others are Philipps). 
(An almost 20 years old Stingrey remains in a good shape.) 
128x128niodari

Showing 1 response by tomcy6

niodari,  unless your old tubes were exposed to extreme conditions like very hot and cold temperatures, they should be OK.  Fifteen years is not much to a tube.  Tubes from the 40s still work fine.  You may need to have your Stingray checked out.  It may be the problem.