It never ceases to amaze me how significant tubes are in an amp. Not only if they are up to spec, but even the difference between types. Even if all your tubes test as good, different tubes can completely change the character of an amp. I know so many guitarist who buy a vintage tube amp, and after two days decide they don't like it, and never even consider a tube swap. Olie, I'm glad you didn't give up on your old SWR. Amps are like pets, they get attached too. :-)