Just uploaded a profile of my '74 50 watt Marshall head with a Fryette S.A.S. pedal slamming the front end. The SAS has an EF86 preamp tube in it and sounds gnarly as hell. I ran the pedal with less than half gain into a fairly clean marshall cranked. I think it sounds pretty fat without getting too far out there. Give it a try! Name is Freyette 74 Marshall.
Pete