Then you are ok. It also seems to be an fixed bias type amp, ( The terms are counterintuitive fixed bias is adjustable, autobias is the type that you don't change, it changes itself, it requires fairly close matched tubes) which require relatively close matches before implementation.
You shouldn't hear a great difference between the channels.
What amp is it that you are using these tubes in?
You shouldn't hear a great difference between the channels.
What amp is it that you are using these tubes in?