Tube Assortment

What is this tube I found, and can I use it in my Guitar amp? It is an RCA and it says 6DJ8 on it.?

I was looking through some old electronic components at an old building I was in, and I found an interesting assortment of electron tubes. I saw two that look a lot like 12AX7′s so I took them home, hoping that I just found two rare tubes. The say 6DJ8 on them in a white block font, have 9 pins, and are made by RCA.

It’s a twin triode. The pin out is at the first link below.
For full specs, there’s a 5 page data sheet at the second link. Scroll down to 6DJ8 and click on each page in turn.

Phantom’s Tube Finale Assortment