This is a great sounding cranked Laney SuperGroup amp in a box similar to the Catalinbread Sabbra Cadabra. This is a J201 based effect and has the trimmers to set the desired voltages. More info on this layout can be found here.

There are a few layouts for this circuit and definitely worth the build. Now I need to get it boxed up.

Storyboardist also did a great 1590B / 125 layout with 9mm pots. I am waiting for the pots to verify this build. Here are the details on that layout.