I see you have a SL-X, I got a question for you.
Actually at the time I got this 2203, I tested the seller's SL-X which he's not selling it. I found the tone in SL-X is so thin compared to this 2203. I don't like the dirty tone coming for it at all. I'm not talking about bedroom level volume, we cranked it past 5.
I bought mine used and are in the process of getting it retubed.
Still, I can't say that I find the sound thin. It's different from the JCM800 but not in a bad way. The SL-X is famous for beeing the amp Kiss used in the old days. When I play the riff from "Detroit Rock City" it's sounded pretty much exactly the same as it does on the CD ....