Interesting. I'd been curious about Sound City amps, but held off because I heard conflicting things about the EQ. Some said they were similar to Hiwatts, which, while cool, have a useless passive mid. I might look out for a MkIV or later Sound City in the future, now knowing they have an active EQ. I prefer active EQ for bass, passive for guitar.
I'm betting you can find one to try out. The MkIV models seem to be the most abundant on the used market. I've sold a couple in your neck of the woods in the past few years and I know a couple other people who have as well.