My system has only two tubes - the pair of 12AX7s in the Pro-Ject Tube Box DS, my stand-alone phono stage. I'd love to do some tube rolling on these but I don't know what I've got nor how to pull them out to see. They might be branded as Pro-Ject anyway. Question #1 - how do I get these out? I can't seem to get a decent purchase with my fingers. Question #2 - what would be good replacements? To Pro-Ject's credit, the installed tubes have tube cooler/dampers.