Anyone ever compare these two amps? I'm losing sleep over the ST-45. My #1 amp the last few years has been the AST. I love everything about it. I would love to have that same sound in a louder, 40 watt package, for the gigs that require the volume. I've played the SST-30 and thought that it would do the trick, but for some reason, didn't really dig it. How similar is the ST-45 to the AST? Is the 45 just a 6L6 version of the SST-30? I'm only asking because, of course, there's none around me.