|Tube testing is about as inexact a process as anything you're likely to come across. The best you can do is to get familiar with how your own tester works and apply windage to the results.
:Hi! I was wondering why when testing a batch of tubes of the same number, one tube in the batch will read past the end of the scale while the others read normal? This happens on two different testers. The tube past the shorts test on both testers and it also past the gas test. Is there a rule of thumb on how high a tube can read past average before it is considered defective? Is there any thing that can be done to the tube to get to read within scale? Thanks for any info. Bob Masse