Procedural wood (Cycles)

I’ve been looking for a good procedural wood texture and ended up finding a real nice one in this thread however due to it being real old at this point all the links to the node setup and blend file downloads are dead. I was able to find a screenshot of the node setup here but I’m struggling to figure out how it works (especially with the tightness and scale nodes) If anyone could help me out I’d greatly apprecieate it! Thanks!