I've been using the Bad Cat Black Cat 30r for the last few years as my main amp. I've always enjoyed this amp and am definitely a EL84 guy. That's just my sound. Of course, after you use a certain piece of gear for a while, you start looking around at other stuff and wonder what you're missing. I'm wondering what I'm missing in the Divided by 13 ERT33 or the RSA31. How would you compare either of these to the Black Cat. I know they'll be similar, but for those of you who have tried both, what's your take on it?