Thats a Marshall solid state head. No tubes. I've never played it, but as a rule solid-state marshall amps are not worth the time of day. I'd look else where
Framus Cobra
Marshall JCM 900
peavey 5150

Mesa 4x12
Mosfet amps are not exactly like the modern SS junk marshall is selling now. Some of em were actually pretty good. They arent tube amps. But there was a time in 80s when replacement tubes could be hard to come by. So mosfets were used. I think randall had some mosfet amps to.