I pulled it out of the Pile o' Crap™. First thing I noticed is that I've been wrong for years. It's not a Concert PA, it's a Studio PA. I scrounged around for tubes. Took it to rehearsal and gingerly turned it on. After all, as far as I know, it still has all of the original caps. I still have the original RCA 6550 power tubes, but I used JJ KT88s this time. No sparks, no smoke, no bad smells. So far, so good.
It's noisy. Keeping the master volume down helps quite a bit. Pots are scratchy. No surprise there, either. Didn't sound too bad.
Used it at a show that night. All of the same issues. Noisy, scratchy pots. Didn't seem to have the low end of either the 200S or even the Sentura II. So it could definitely use some new caps and new tubes, but even then, I don't think it will work well for bass, if one wants deep bass. For those who want a less deep, more punchy sound, it should work well. Or, with the master volume, one could crank the preamp volume and get some distortion at low levels. And it does have four independent inputs!