This was a request that came in from Cody from the They Remained Silent blog. It’s an emulator of the Laney Super Group 100 watt head designed by Heuller Pinson (MallerMB). I would assume you should bias the JFETs to ~4.5v then adjust from there. Don’t have a ton of info on this other than that. This one’s laid out for onboard 9mm pots mounted from the solder-side. Cody asked for it to fit in a 125B, but you should be able to squeeze it into a 1590B.
Here’s the schematic if anyone wants it.
