With Mr. Davis focusing his time on developing new pedals for a different brand, this thread may become more and more important in keeping some of these rare old pedals going. The AD I was working on was given back to it’s owner some time ago.
I ended up having to reach out to some others for more input, as I was beating my head against the wall trying to figure out what was causing the “no effect” problem I was having. Instead of taking the time to look at what each part of the circuit was doing, I was just looking for bad parts, etc. Bad form on my part. When I was signal tracing with my o-scope, I was just picking up noise, not signal. Initially, it was a bad coupling cap after the first 4558 stage that was tripping me up. Once that bad coupling cap was figured out, I had a bit of an “Ah HA!” moment, and delved into what each ICs function was and things moved along quicker. Replaced a few ICs, then replaced the tants and ‘lytics, as a couple new chips went bad. After that, I spent a lot of time trying to get rid of extra noise that I thought was an indication something still wasn’t right. A few folks pointed out that, due to the compression early in the effect, they were just naturally noisy, and likely couldn’t be made quieter without significant modification.