or more simply ..... the offending tube is likely in the V1 position.
Well, V1 was the one that sounded different, but like I said, since all 3 have different functions, I thought that might account for the difference in tone.
All I can get locally is a Groove Tubes, which is what is already in there, so I'm gonna order an Electro Harmonix 12AX7EH. We'll see what happens and I will report back.
Thanks for all of the help and opinions.