I have a dr z Jaz 20/40 amp and have been told that I can change out the quad of 6v6btubes for 5881s. My question is this. Isn't a 5881 basically a 6L6? Would it hurt to just get 6L6 tubes and make the swap or would I need 5881 specifically? Is there a huge difference in tone from a 5881 vs 6l6 vs 6v6?