Just got some tubes ordered online and opened the box's to find each base labeled with 31.0 on one and 32.1 on the other.
Should this be a matched pair?
What's the no's indicate. it's not ma's is it ?
What is a good match?

Don't want to sound stupid butt what do i know it's better than roastin an OT.
Thank you very much
Med. 8)