Pardon my ignorance, please. I have a multimeter set at 0.000 range and I check my EL34's to "zero" them as per Justin's video because I can. My stock new issue Mullard's that are well matched in plate voltage drift all over the place. My question is do they settle down over time and use or is this "normal". Truthfully I can not tell much sonic difference other than they continue to get better in my perception of midrange vocals with increasing hours, now at a little 50 hours. Education appreciated.
define "all over the place"