OMG you just reminded me that I built that circuit way back then. As I recall it was simple. I still have the little grey box I mounted it in. I was surprised by the fact it was dead quite. Surprised with myself that is that it worked...lol. I was 19 I think. I actually don't recall what I used it on back then. I had a pair of A7's back then. But I don't remember having a center channel. So why did i make that box now...hmmmm. But I did make that box as it's in my collection of gear still....ah memories. I'm gonna dig it out now that I'm thinking of it.
Yes it was from the Dope From hope papers. I still have the pile of them in a binder form. I'll snap a pic when I find them.