He’s got the bug! Welcome to the rabbit hole, Alice 
I actually have been trying out some different tubes on the LP lately, yes. I got a couple of sets, including those Gold Lions. I need more time with the new tubes before I can say anything meaningful. I’ll post some thoughts in the official LP thread when I’m ready (edit: I should mention that you should move LP questions to the LP thread from here on out, especially since the LP does not appear in this thread title).
However, there’s no reason NOT to try new tubes if you’re curious and have the money. Tubes can change the sound subtly or dramatically depending on what you want and where you get them. I’m still learning the ins and outs of tubes so I won’t be of huge help on that yet. If you buy brand new tubes though, you’ll need to burn them in. Burn-in times can also vary wildly. Just keep that in mind.