Hey guys, I wanted to swap my 25W Archon power tubes. I think mine has the 5881's (Tung sol's), and I find the tone to be a little too flat on top, and dark. I was wondering what kind of tubes I can use to replace the 5881's? I know EL34, 6l6GC, and KT77 have higher wattage ratings, so I can't use them. If anyone could provide me with recommendations it would be very much appreciated!