http://www.w8ji.com/vacuum_tubes_and_vaccum_tube_failures.htm Barry - N4BUQ On Wed 02/03/11 8:43 PM , "KA9EGW" ka9egw at britewerkz.com sent: > There's a pretty good article at w8jj dot com about gettering and tube > failures > 73, Brian KA9EGW